clusterversion: move to 26.1 version

This change advances the current release series version on master from
25.4 to 26.1, following the standard M.1 process after forking the
release-25.4 branch. This allows the addition of new upgrade gates for
version 26.1 and prepares master for the next development cycle.

Changes implemented following the M.1 checklist from pkg/clusterversion/README.md:
- Added version key constant V26_1 (=Latest) and final version V25_4
- Added start version V26_1_Start (version 25.4-2) with first upgrade
- Updated SystemDatabaseSchemaBootstrapVersion to V26_1_Start
- Updated roachpb.successorSeries map (25.4 -> 26.1)
- Updated pkg/build/version.txt to v26.1.0-alpha.00000000
- Copied scplan rules from current to release_25_4
- Updated package names and version references in scplan rules
- Updated rulesForReleases in scplan/plan.go
- Regenerated test outputs for scplan and TestDeclarativeRules
- Updated releases file (25.4 entries removed as expected)
- Regenerated bootstrap test data with updated hash values

Note: PreviousRelease is NOT updated in this change - this only happens
in M.3 after the first 25.4 RC is published.

Release note: None
Epic: None

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: celiala

docs/generated/settings/settings-for-tenants.txt

@@ -426,4 +426,4 @@ trace.zipkin.collector	string		the address of a Zipkin instance to receive trace
 ui.database_locality_metadata.enabled	boolean	true	if enabled shows extended locality data about databases and tables in DB Console which can be expensive to compute	application
 ui.default_timezone	string		the default timezone used to format timestamps in the ui	application
 ui.display_timezone	enumeration	etc/utc	the timezone used to format timestamps in the ui. This setting is deprecatedand will be removed in a future version. Use the 'ui.default_timezone' setting instead. 'ui.default_timezone' takes precedence over this setting. [etc/utc = 0, america/new_york = 1]	application
-version	version	1000025.3-upgrading-to-1000025.4-step-014	set the active cluster version in the format '<major>.<minor>'	application
+version	version	1000025.4-upgrading-to-1000026.1-step-002	set the active cluster version in the format '<major>.<minor>'	application

docs/generated/settings/settings.html

@@ -385,6 +385,6 @@
 <tr><td><div id="setting-ui-database-locality-metadata-enabled" class="anchored"><code>ui.database_locality_metadata.enabled</code></div></td><td>boolean</td><td><code>true</code></td><td>if enabled shows extended locality data about databases and tables in DB Console which can be expensive to compute</td><td>Basic/Standard/Advanced/Self-Hosted</td></tr>
 <tr><td><div id="setting-ui-default-timezone" class="anchored"><code>ui.default_timezone</code></div></td><td>string</td><td><code></code></td><td>the default timezone used to format timestamps in the ui</td><td>Basic/Standard/Advanced/Self-Hosted</td></tr>
 <tr><td><div id="setting-ui-display-timezone" class="anchored"><code>ui.display_timezone</code></div></td><td>enumeration</td><td><code>etc/utc</code></td><td>the timezone used to format timestamps in the ui. This setting is deprecatedand will be removed in a future version. Use the &#39;ui.default_timezone&#39; setting instead. &#39;ui.default_timezone&#39; takes precedence over this setting. [etc/utc = 0, america/new_york = 1]</td><td>Basic/Standard/Advanced/Self-Hosted</td></tr>
-<tr><td><div id="setting-version" class="anchored"><code>version</code></div></td><td>version</td><td><code>1000025.3-upgrading-to-1000025.4-step-014</code></td><td>set the active cluster version in the format &#39;&lt;major&gt;.&lt;minor&gt;&#39;</td><td>Basic/Standard/Advanced/Self-Hosted</td></tr>
+<tr><td><div id="setting-version" class="anchored"><code>version</code></div></td><td>version</td><td><code>1000025.4-upgrading-to-1000026.1-step-002</code></td><td>set the active cluster version in the format &#39;&lt;major&gt;.&lt;minor&gt;&#39;</td><td>Basic/Standard/Advanced/Self-Hosted</td></tr>
 </tbody>
 </table>

pkg/BUILD.bazel

@@ -610,6 +610,7 @@ ALL_TESTS = [
     "//pkg/sql/schemachanger/scplan/internal/rules/current:current_test",
     "//pkg/sql/schemachanger/scplan/internal/rules/release_25_2:release_25_2_test",
     "//pkg/sql/schemachanger/scplan/internal/rules/release_25_3:release_25_3_test",
+    "//pkg/sql/schemachanger/scplan/internal/rules/release_25_4:release_25_4_test",
     "//pkg/sql/schemachanger/scplan/internal/scgraph:scgraph_test",
     "//pkg/sql/schemachanger/scplan:scplan_test",
     "//pkg/sql/schemachanger/screl:screl_test",
@@ -2290,6 +2291,8 @@ GO_TARGETS = [
     "//pkg/sql/schemachanger/scplan/internal/rules/release_25_2:release_25_2_test",
     "//pkg/sql/schemachanger/scplan/internal/rules/release_25_3:release_25_3",
     "//pkg/sql/schemachanger/scplan/internal/rules/release_25_3:release_25_3_test",
+    "//pkg/sql/schemachanger/scplan/internal/rules/release_25_4:release_25_4",
+    "//pkg/sql/schemachanger/scplan/internal/rules/release_25_4:release_25_4_test",
     "//pkg/sql/schemachanger/scplan/internal/rules:rules",
     "//pkg/sql/schemachanger/scplan/internal/scgraph:scgraph",
     "//pkg/sql/schemachanger/scplan/internal/scgraph:scgraph_test",

pkg/build/version.txt

@@ -1 +1 @@
-v25.4.0-alpha.2
+v26.1.0-alpha.00000000

pkg/ccl/logictestccl/testdata/logic_test/crdb_internal_tenant

@@ -304,7 +304,7 @@ select crdb_internal.get_vmodule()
 query T
 SELECT crdb_internal.release_series(crdb_internal.node_executable_version())
 ----
-25.4
+26.1
 
 query ITTT colnames,rowsort
 select node_id, component, field, regexp_replace(regexp_replace(value, '^\d+$', '<port>'), e':\\d+', ':<port>') as value from crdb_internal.node_runtime_info
@@ -392,7 +392,7 @@ select * from crdb_internal.gossip_alerts
 query T
 SELECT crdb_internal.release_series(crdb_internal.node_executable_version())
 ----
-25.4
+26.1
 
 user root
 

pkg/cli/testdata/declarative-rules/invalid_version

@@ -6,3 +6,4 @@ unsupported version number, the supported versions are:
  latest
  1000025.2
  1000025.3
+ 1000025.4