clusterversion: introduce rac2 cluster version gates

Introduce two new cluster version gates:

```
V24_3_UseRACV2WithV1EntryEncoding
V24_3_UseRACV2Full
```

Upon a range leader first encountering
`V24_3_UseRACV2WithV1EntryEncoding` via `handleRaftReadyRaftMuLocked`,
it will begin a new term using the replication flow control v2 protocol,
creating a `RangeController` but continue using the v1 entry encoding
and raft still operating in push mode.

Upon a range leader first encountering `V24_3_UseRACV2Full`, it will continue
using the replication flow control v2 protocol, but will now switch to
using the V2 entry encoding.

Note that the necessary protocol migration at the leader, (base) =>
`V24_3_UseRACV2WithV1EntryEncoding` occurs before any other calls in
`handleRaftReadyRaftMuLocked`.

The two version gates are necessary to ensure there are never v2 encoded
entries in the raft log while there is a possibility of a leader running
v1.

Resolves: #131102
Release note: None

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

@@ -399,4 +399,4 @@ trace.snapshot.rate	duration	0s	if non-zero, interval at which background trace
 trace.span_registry.enabled	boolean	true	if set, ongoing traces can be seen at https://<ui>/#/debug/tracez	application
 trace.zipkin.collector	string		the address of a Zipkin instance to receive traces, as <host>:<port>. If no port is specified, 9411 will be used.	application
 ui.display_timezone	enumeration	etc/utc	the timezone used to format timestamps in the ui [etc/utc = 0, america/new_york = 1]	application
-version	version	1000024.2-upgrading-to-1000024.3-step-016	set the active cluster version in the format '<major>.<minor>'	application
+version	version	1000024.2-upgrading-to-1000024.3-step-020	set the active cluster version in the format '<major>.<minor>'	application

docs/generated/settings/settings.html

@@ -356,6 +356,6 @@
 <tr><td><div id="setting-trace-span-registry-enabled" class="anchored"><code>trace.span_registry.enabled</code></div></td><td>boolean</td><td><code>true</code></td><td>if set, ongoing traces can be seen at https://&lt;ui&gt;/#/debug/tracez</td><td>Serverless/Dedicated/Self-Hosted</td></tr>
 <tr><td><div id="setting-trace-zipkin-collector" class="anchored"><code>trace.zipkin.collector</code></div></td><td>string</td><td><code></code></td><td>the address of a Zipkin instance to receive traces, as &lt;host&gt;:&lt;port&gt;. If no port is specified, 9411 will be used.</td><td>Serverless/Dedicated/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 [etc/utc = 0, america/new_york = 1]</td><td>Serverless/Dedicated/Self-Hosted</td></tr>
-<tr><td><div id="setting-version" class="anchored"><code>version</code></div></td><td>version</td><td><code>1000024.2-upgrading-to-1000024.3-step-016</code></td><td>set the active cluster version in the format &#39;&lt;major&gt;.&lt;minor&gt;&#39;</td><td>Serverless/Dedicated/Self-Hosted</td></tr>
+<tr><td><div id="setting-version" class="anchored"><code>version</code></div></td><td>version</td><td><code>1000024.2-upgrading-to-1000024.3-step-020</code></td><td>set the active cluster version in the format &#39;&lt;major&gt;.&lt;minor&gt;&#39;</td><td>Serverless/Dedicated/Self-Hosted</td></tr>
 </tbody>
 </table>

pkg/clusterversion/cockroach_versions.go

@@ -247,6 +247,15 @@ const (
 	// policies.
 	V24_3_MaybePreventUpgradeForCoreLicenseDeprecation
 
+	// V24_3_UseRACV2WithV1EntryEncoding is the earliest version which supports
+	// ranges using replication flow control v2, still with v1 entry encoding.
+	V24_3_UseRACV2WithV1EntryEncoding
+
+	// V24_3_UseRACV2Full is the earliest version which supports ranges using
+	// replication flow control v2, with v2 entry encoding. Replication flow
+	// control v1 is unsupported at this version.
+	V24_3_UseRACV2Full
+
 	// *************************************************
 	// Step (1) Add new versions above this comment.
 	// Do not add new versions to a patch release.
@@ -302,6 +311,8 @@ var versionTable = [numKeys]roachpb.Version{
 	V24_3_AdvanceCommitIndexViaMsgApps:                 {Major: 24, Minor: 2, Internal: 12},
 	V24_3_SQLInstancesAddDraining:                      {Major: 24, Minor: 2, Internal: 14},
 	V24_3_MaybePreventUpgradeForCoreLicenseDeprecation: {Major: 24, Minor: 2, Internal: 16},
+	V24_3_UseRACV2WithV1EntryEncoding:                  {Major: 24, Minor: 2, Internal: 18},
+	V24_3_UseRACV2Full:                                 {Major: 24, Minor: 2, Internal: 20},
 
 	// *************************************************
 	// Step (2): Add new versions above this comment.