[ACM-9339] Re-enabled clusters mgmt api

[dislbenn]

Description

Re-added clusters_mgmt API usage in discovery controller.

Related Issue

https://issues.redhat.com/browse/ACM-9339

Changes Made

Updated discovery controller to use clusters_mgmt API.

Screenshots (if applicable)

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Checklist

• I have tested the changes locally and they are functioning as expected.
• I have updated the documentation (if necessary) to reflect the changes.
• I have added/updated relevant unit tests (if applicable).
• I have ensured that my code follows the project's coding standards.
• I have checked for any potential security issues and addressed them.
• I have added necessary comments to the code, especially in complex or unclear sections.
• I have rebased my branch on top of the latest main/master branch.

Additional Notes

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Reviewers

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Definition of Done

• Code is reviewed.
• Code is tested.
• Documentation is updated.
• All checks and tests pass.
• Approved by at least one reviewer.
• Merged into the main/master branch.

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dislbenn

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[sonarcloud]

Quality Gate passed

Issues
7 New issues
0 Accepted issues

Measures
0 Security Hotspots
62.6% Coverage on New Code
1.7% Duplication on New Code

See analysis details on SonarCloud

[openshift-merge-robot]

PR needs rebase.

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