[8.x] [FTR] Merge Alerting Apis from x-pack/test_serverless/shared into x-pack/test/api_integration/deployment_agnostic (#193975)

[8.x] [FTR] Merge Alerting Apis from x-pack/test_serverless/shared into x-pack/test/api_integration/deployment_agnostic (#193975) #9725