[chore] Add `local` folder to .gitignore #21966

Job	Run time
windows-service-test (windows-2022)	2m 20s
windows-unittest (windows-2022)	19m 4s
windows-service-test (windows-2025)	1m 28s
windows-unittest (windows-2025)	20m 1s
	42m 53s

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