[INLONG-8547][Manager] Add workflow approver automatically when create a new tenant

[vernedeng]

Prepare a Pull Request

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

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• Fixes [Feature][Manager] Add workflow approver automatically when create a new tenant #8547

Motivation

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Modifications

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Verifying this change

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• 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:

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  • 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)
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• If a feature is not documented yet in this PR, please create a follow-up issue for adding the documentation