sql: deprecate SCRUB command

Trimmed the `SCRUB` implementation down to a notice directing users to
the `INSPECT` command. The `pkg/sql/scrub` errors package is left intact
as it's still used in a number of other packages.

A test helper is updated to use `INSPECT` and `SHOW INSPECT ERRORS`
commands.

Fixes: #148274
Epic: CRDB-55075

Release note (sql change): The `EXPERIMENTAL SCRUB` command is
deprecated. The `INSPECT` command should be used for data consistency
validation.

Author: bghal

pkg/BUILD.bazel

@@ -2310,7 +2310,6 @@ GO_TARGETS = [
     "//pkg/sql/schemachanger:schemachanger",
     "//pkg/sql/schemachanger:schemachanger_test",
     "//pkg/sql/schemaobjectlimit:schemaobjectlimit",
-    "//pkg/sql/scrub/scrubtestutils:scrubtestutils",
     "//pkg/sql/scrub:scrub",
     "//pkg/sql/sem/asof:asof",
     "//pkg/sql/sem/asof:asof_test",

pkg/ccl/partitionccl/BUILD.bazel

@@ -37,7 +37,6 @@ go_test(
         "drop_test.go",
         "main_test.go",
         "partition_test.go",
-        "scrub_test.go",
         "zone_test.go",
     ],
     embed = [":partitionccl"],
@@ -69,9 +68,6 @@ go_test(
         "//pkg/sql/lexbase",
         "//pkg/sql/parser",
         "//pkg/sql/randgen",
-        "//pkg/sql/rowenc",
-        "//pkg/sql/scrub",
-        "//pkg/sql/scrub/scrubtestutils",
         "//pkg/sql/sem/tree",
         "//pkg/sql/tests",
         "//pkg/sql/types",