feat: Automated regeneration of datastore v1 client (#26703) #46790

Job	Run time
CI (ubuntu-latest, 3.3, --include-spec)	39s
CI (ubuntu-latest, 4.0, --include-spec --include-yardoc --include-build, --enable-frozen-string-l...	48s
CI (windows-latest, 4.0, --include-spec)	1m 35s
CI (macos-latest, 4.0, --include-spec)	46s
CI (ubuntu-latest, 3.4, --include-spec)	52s
CI (ubuntu-latest, 3.2, --include-spec)	35s
	5m 15s

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