[CHANGE ME] Combining pull requests

[chingor13]

Combining multiple, similar PRs into a single PR:

• Regenerate automl client (Regenerate automl client #4059)
• Regenerate bigquerydatatransfer client (Regenerate bigquerydatatransfer client #4060)
• Regenerate bigtable-admin client (Regenerate bigtable-admin client #4061)
• Regenerate compute client (Regenerate compute client #4062)
• Regenerate containeranalysis client (Regenerate containeranalysis client #4063)
• Regenerate dataproc client (Regenerate dataproc client #4064)
• Regenerate dialogflow client (Regenerate dialogflow client #4065)
• Regenerate dlp client (Regenerate dlp client #4066)
• Regenerate errorreporting client (Regenerate errorreporting client #4067)
• Regenerate firestore client (Regenerate firestore client #4068)
• Regenerate kms client (Regenerate kms client #4070)
• Regenerate logging client (Regenerate logging client #4072)
• Regenerate redis client (Regenerate redis client #4073)
• Regenerate scheduler client (Regenerate scheduler client #4074)
• Regenerate securitycenter client (Regenerate securitycenter client #4075)
• Regenerate spanner client (Regenerate spanner client #4076)
• Regenerate tasks client (Regenerate tasks client #4078)