:bug: tenancy/workspace-deletion: try harder with the admin client to delete the LogicalCluster

[sttts]

Summary

The front-proxy might return errors when looking for the LogicalCluster on workspace deletion, especially when the LogicalCluster is already gone, and it returns a 403. This PR adds another attempt through the workspace admin client.

Related issue(s)

Fixes #

Release Notes

Make workspace deletion more reliable, trying harder to not leak `LogicalClusters`.

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/lgtm

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[kcp-ci-bot]

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/lifecycle stale

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Stale issues rot after 30d of inactivity. Mark the issue as fresh with /remove-lifecycle rotten. Rotten issues close after an additional 30d of inactivity.

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/lifecycle rotten

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/close

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@kcp-ci-bot: Closed this PR.

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Rotten issues close after 30d of inactivity. Reopen the issue with /reopen. Mark the issue as fresh with /remove-lifecycle rotten.

/close

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[sttts]

/reopen

[kcp-ci-bot]

@sttts: Reopened this PR.

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/reopen

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[sttts]

/approve

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