chore: mark RC1 releases as GA (#7492)

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BigQueryAnalyticsHub: 1.0.0
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GkeHub: 1.0.0
Grafeas: 1.0.0
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SqlAdmin: 1.0.0
VideoLiveStream: 1.0.0
VideoStitcher: 1.0.0
VideoTranscoder: 1.0.0
VmMigration: 1.0.0
WebSecurityScanner: 1.0.0
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