[5.9] [SymbolGraphGen] don't emit symbols and protocols from unconditionally unavailable extensions #67540
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Cherry-pick of #67539
Explanation: Prevents protocols and symbols added via unconditionally-unavailable extensions from appearing in symbol graphs.
Scope: Affects documentation of projects that use this pattern to forbid protocols like
Sendable
.Issue: rdar://112137607
Risk: Low. This fix is targeted to SymbolGraphGen, doesn't affect normal compilation, and hides symbols and relationships that should be considered unavailable.
Testing: Automated tests have been added to ensure the new behavior.
Reviewer: @daniel-grumberg