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Move inline script from `diagnostics-export.yml` to a `.ts` file #6481

Job	Run time
Autobuild direct tracing (custom working directory) (windows-latest, linked)	3m 45s
Autobuild direct tracing (custom working directory) (ubuntu-latest, nightly-latest)	1m 11s
Autobuild direct tracing (custom working directory) (windows-latest, nightly-latest)	2m 49s
Autobuild direct tracing (custom working directory) (ubuntu-latest, linked)	1m 12s
	8m 57s