clusterversion,kvserver,server,security:remove 22.1 gates

[celiala]

This commit removes the following 22.1 version gates:

**Version gates from 8/8 **

• kvserver: ProbeRequest,
• security,pgwire: SCRAMAuthentication,
• server: UnsafeLossOfQuorumRecoveryRangeLog,
• kvserver: AlterSystemProtectedTimestampAddColumn

8/10 Update: Additionally, these version gates to added to this commit

• backupccl: EnableProtectedTimestampsForTenant
• DeleteCommentsWithDroppedIndexes
• sql/catalog: RemoveIncompatibleDatabasePrivileges
• kvserver: AddRaftAppliedIndexTermMigration
• clusterversion: PostAddRaftAppliedIndexTermMigration
• kvserver: DontProposeWriteTimestampForLeaseTransfers
• storage: EnablePebbleFormatVersionBlockProperties
• sql: MVCCIndexBackfiller
• kvserver: LooselyCoupledRaftLogTruncation
• sql: RowLevelTTL
• kvserver: EnableNewStoreRebalancer
• sql: SuperRegions
• changefeedccl: EnableNewChangefeedOptions
• SpanCountTable
• spanconfig: PreSeedSpanCountTable, SeedSpanCountTable
• sql: EnableDeclarativeSchemaChanger

The cleanup for these version gates was fairly straight-forward, using the guidance from 21.2 cleanup:

For the most part, if the gates were just simple if !version.IsActive { return x } or something, I just removed the block, and even if it was a little more complicated, like args = [x]; if version { args = append(args, y) }; foo(args) I still tried to mostly inline it such that it looked natural (i.e. remove that append and make it args = [x, y]).

22.1 version gates requiring more nuanced removal will be done in separate PRs.

Partially addresses https://github.com/cockroachdb/cockroach/issues/80663

[cockroach-teamcity]

This change is 

[celiala]

@dt @irfansharif - I'm going to remove the version gates in multiple passes, but let me know if version gate removal + bumping minVersion needs to be done more atomically. Thanks!

[celiala]

bors r+

[celiala]

bors cancel

[craig[bot]]

Canceled.

[celiala]

I meant to push the additional 8/10 version gate removals to a separate branch, but accidentally pushed to this PR:

Since the 8/10 commits were also straight-forward removals, I will go ahead and keep them in this PR. But this means I'm re-adding @cockroachdb/kv-prs to review the version gates that have been added today.

[postamar]

Schema LGTM for:

• clusterversion: remove DeleteCommentsWithDroppedIndexes
• clusterversion,sql: remove MVCCIndexBackfiller
• clusterversion,sql: remove EnableDeclarativeSchemaChanger
• clusterversion,sql: remove RowLevelTTL
• clusterversion,sql: remove SuperRegions

[celiala]

TFTRs!

bors r+

8/12 Update: These version gate removals were reverted (removed from this PR) to pass tests. To be addressed separately (future PRs):

• storage: EnablePebbleFormatVersionBlockProperties
• sql: RowLevelTTL
• sql: SuperRegions
• changefeedccl: EnableNewChangefeedOptions

[craig[bot]]

Build succeeded:

• Bazel Essential CI (Cockroach)