feat: Automated regeneration of datamigration v1beta1 client (#26710) #46820

Job	Run time
CI (ubuntu-latest, 3.3, --include-spec)	40s
CI (ubuntu-latest, 4.0, --include-spec --include-yardoc --include-build, --enable-frozen-string-l...	51s
CI (ubuntu-latest, 3.4, --include-spec)	40s
CI (ubuntu-latest, 3.2, --include-spec)	38s
CI (windows-latest, 4.0, --include-spec)	1m 49s
CI (macos-latest, 4.0, --include-spec)	20s
	4m 58s

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