[LucaCappelletti94]

PostgreSQL accepts DROP GROUP [IF EXISTS] name [, ...] as an alias for DROP ROLE.

Sliced out of #2429 to minimize size of both PRs, although they will have some collisions and need a rebase since they are in older external branches and I could not stack them.

PostgreSQL syntax reference https://www.postgresql.org/docs/current/sql-dropgroup.html

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.49%. Comparing base (a9c0767) to head (a22bf96).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2712      +/-   ##
==========================================
+ Coverage   82.48%   82.49%   +0.01%     
==========================================
  Files          42       42              
  Lines       35468    35479      +11     
  Branches    35468    35479      +11     
==========================================
+ Hits        29255    29269      +14     
+ Misses       2676     2674       -2     
+ Partials     3537     3536       -1     

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[sabir-akhadov-localstack]

Non-blocking: on dialects without supports_drop_group this now reads Expected: ... GROUP, ... after DROP, found: GROUP (the gated test asserts exactly that). Listing GROUP only when the dialect supports it would avoid the contradiction.