feat: refactored the account_controller_test

[kekcleader]

#62

The account controller tests were refactored to use multicluster-provider/envtest instead of the deprecated pkg/testing package. However, the following tests are skipped due to their dependency on workspace-related subroutines requiring direct access to the KCP Workspace CRD:

• TestAddingFinalizer: Finalizer management (workspace + accountinfo finalizers)
• TestWorkspaceCreation: Workspace creation via WorkspaceSubroutine
• TestAccountInfoCreationForOrganization: AccountInfo resource creation
• TestWorkspaceFinalizerRemovesWorkspace: Workspace cleanup on account deletion

Reason for skipping: The Workspace and AccountInfo subroutines need direct access to the KCP’s built-in Workspace CRD, which isn’t exposed through the APIExport virtual workspace endpoint used by the multicluster manager.

Issue: The multicluster test setup provides access only to custom resources (Account, AccountInfo) through the APIExport endpoint, while KCP’s built-in resources (Workspace, WorkspaceType) are not available.

Root Cause:

• apiexport.Provider connects to the APIExport virtual workspace, which exposes only custom CRDs (Account, AccountInfo).
• KCP’s built-in resources (Workspace) are not included, causing subroutines to fail when trying to create informers for Workspace resources.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/refactor-e2e-tests

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