[v3-3-test] Run UI compile checks in CI when only an OpenAPI spec changes (#70643)

[github-actions]

#68919 changed _private_ui.yaml without regenerating the TypeScript client
and CI stayed green: selective checks decide whether to skip the
ts-compile-lint-* hooks from file groups that do not cover the UI codegen
input specs, while the hooks themselves trigger on any yaml under the
openapi directories. The stale client then masked a type error that broke
main for every PR running full static checks. The same gap applied to
v2-simple-auth-manager-generated.yaml, so a spec-only change also skipped
the simple auth manager UI hook. Track the codegen-input specs in their own
file group so spec-only changes run the UI hooks without forcing the full
test matrix, and drop the main UI hook trigger for the simple auth manager
spec: that pattern was copied in when the hook was created (#51725), a
month after the spec was renamed v1 to v2 (#50705), so it has never matched
a file - #53636 fixed the sibling hook's copy but missed this one. The main
UI codegen does not consume that spec either.
(cherry picked from commit b43a87e)

Co-authored-by: Shahar Epstein 60007259+shahar1@users.noreply.github.com

[pierrejeambrun]

@shahar1 Something is off here, I wonder if it's transient or caused by the PR.

[potiuk]

Rebased onto the current v3-3-test tip; the backport replays cleanly and the tests and prek hooks it touches pass locally against this branch.

Scope-checked for a maintenance branch: this is a bugfix / documentation / dev-tooling change, with no new user-facing behaviour.

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Drafted-by: Claude Code (Opus 5) (no human review before posting)