opt: 22.1 release checklist

[rytaft]

This issue captures a series of tests and steps that we need to run when 22.1 is getting close to being finalized.

• check bug fixes that may need backport
• check and update private opt tests repository
• check regressions in microbenchmarks
• run all tests with TAGS=fast_int_set_small and TAGS=fast_int_set_large
• check that any new session settings have a cluster setting for the default (or a good justification for why not)
• consider adding session+cluster settings for all new features
• check TODOs in opt code (especially those added since the last release): sql: confirm that there are no outstanding TODOs required for the 22.1 release #79137
• clone an instance of this issue for the next release
• check the SQL Queries high likelihood bucket for issues that we'd really like to get into the release

Jira issue: CRDB-11497

[mgartner]

SQL Queries session settings that were added without cluster default settings include:

• disable_plan_gists
• index_recommendations_enabled
• null_ordered_last
• cost_scans_with_default_col_size
• default_transaction_quality_of_service
• opt_split_scan_limit

[mgartner]

As of 22.1, users can set default session settings for all roles (or a particular role) with ALTER ROLE .... For example: ALTER ROLE ALL SET index_recommendations_enabled = false. So cluster settings aren't necessary.