feat: Automated regeneration of discoveryengine v1beta client #43529

Job	Run time
CI (ubuntu-latest, 3.4, --include-spec --include-yardoc --include-build, --enable-frozen-string-l...	1m 51s
CI (ubuntu-latest, 3.2, --include-spec)	37s
CI (ubuntu-latest, 3.1, --include-spec)	37s
CI (macos-latest, 3.4, --include-spec)	43s
CI (windows-latest, 3.4, --include-spec)	1m 55s
CI (ubuntu-latest, 3.3, --include-spec)	40s
	6m 23s

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