[INLONG-8531][Manager] Restrict cluster permission to Inlong administrator

[vernedeng]

Prepare a Pull Request

(Change the title refer to the following example)

• Title Example: [INLONG-XYZ][Component] Title of the pull request

(The following XYZ should be replaced by the actual GitHub Issue number)

• Fixes [Feature][Manager] Restrict cluster permission to Inlong administrator #8531

Motivation

Restrict cluster permission to Inlong administrator

Modifications

1. Remove tenant of inlong cluster
2. Only inlong admin can modify clusters

Verifying this change

(Please pick either of the following options)

• This change is a trivial rework/code cleanup without any test coverage.

• This change is already covered by existing tests, such as:
  (please describe tests)

• This change added tests and can be verified as follows:

  (example:)

  • Added integration tests for end-to-end deployment with large payloads (10MB)
  • Extended integration test for recovery after broker failure

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)
• If a feature is not applicable for documentation, explain why?
• If a feature is not documented yet in this PR, please create a follow-up issue for adding the documentation