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Use `setup-codeql` logic for finding release assets in `start-proxy` #6411

Job	Run time
Autobuild direct tracing (custom working directory) (ubuntu-latest, nightly-latest)	1m 19s
Autobuild direct tracing (custom working directory) (windows-latest, nightly-latest)	3m 1s
Autobuild direct tracing (custom working directory) (ubuntu-latest, linked)	1m 17s
Autobuild direct tracing (custom working directory) (windows-latest, linked)	3m 58s
	9m 35s