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Move inline script from `diagnostics-export.yml` to a `.ts` file #9429

Job	Run time
Ruby analysis (ubuntu-latest, linked)	42s
Ruby analysis (ubuntu-latest, nightly-latest)	47s
Ruby analysis (macos-latest, nightly-latest)	1m 6s
Ruby analysis (ubuntu-latest, default)	43s
Ruby analysis (macos-latest, linked)	1m 8s
Ruby analysis (macos-latest, default)	1m 13s
	5m 39s