CLOUDP-323473: Migrate watchers to latest SDK

[blva]

Proposed changes

Jira ticket: CLOUDP-323473

• Since watchers only return state and name of the cluster, we can already use the latest SDK for all clusters watchers
• https://spruce.mongodb.com/version/6846d50e01104b0007bd2d5b/tasks?sorts=STATUS%3AASC%3BBASE_STATUS%3ADESC

Checklist

• I have signed the MongoDB CLA
• I have added tests that prove my fix is effective or that my feature works
• I have added any necessary documentation in document requirements section listed in CONTRIBUTING.md (if appropriate)
• I have addressed the @mongodb/docs-cloud-team comments (if appropriate)
• I have updated test/README.md (if an e2e test has been added)
• I have run make fmt and formatted my code

Further comments

[github-actions]

Coverage Report 📈

Branch	Commit	Coverage
CLOUDP-302696-clusters-iss-epic	9c7dd4e	25.1%
CLOUDP-323473	84bdb22	25.1%
	Difference	0%