KAFKA-15727: Added KRaft support in AlterUserScramCredentialsRequestNotAuthorizedTest

[adixitconfluent]

About This PR adds KRaft support to the following tests in AlterUserScramCredentialsRequestNotAuthorizedTest class -

1. testAlterNothingNotAuthorized
2. testAlterSomethingNotAuthorized

reference - KAFKA-15727

Testing Adding screenhots confirming the tests are passing on CLI for AlterUserScramCredentialsRequestNotAuthorizedTest

Committer Checklist (excluded from commit message)

• [ ] Verify design and implementation
• [ ] Verify test coverage and CI build status
• [ ] Verify documentation (including upgrade notes)

[github-actions[bot]]

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[adixitconfluent]

The test failures in build result look unrelated.