Filter list of candidate invocations for parsing in binding generator

[layomia]

Improves generator perf tracing metrics on the Roslyn repo recorded by GeneratorTracer. Average time spent in the generator goes from ~2s to ~145ms. See https://gist.github.com/layomia/8f51ac107f76853f4f37a6a7c596f67e.

Contributes to #83534. Next steps would be to

• simplify/consolidate the incremental parsing steps and inline the creation of generation specs.
• modify the parsed generation spec types to be incremental inputs to the Execute/emitter phase.

[ghost]

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Issue Details

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Improves generator perf tracing metrics recorded by GeneratorTracer. See https://gist.github.com/layomia/8f51ac107f76853f4f37a6a7c596f67e.

Contributes to #83534. Next steps would be to

• simplify/consolidate the incremental parsing steps and inline the creation of generation specs.
• modify the parsed generation spec types to be incremental inputs to the Execute/emitter phase.

Author:	layomia
Assignees:	layomia
Labels:	area-Extensions-Configuration
Milestone:	8.0.0

[tarekgh]

LGTM

[layomia]

/backport to release/8.0-preview7

[github-actions]

Started backporting to release/8.0-preview7: https://github.com/dotnet/runtime/actions/runs/5614162921