ensure resource template be un-claimed when deleting cluster policy

[whitewindmills]

What type of PR is this? /kind bug

What this PR does / why we need it:

Which issue(s) this PR fixes: Fixes #4233

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

`karmada-controller-manager`: Fix the bug that losing the chance to un-claim resource template in case of deleting ClusterPropagationPolicy.

[codecov-commenter]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (58b1790) 51.87% compared to head (f84a0e5) 51.85%.

Files	Patch %	Lines
pkg/detector/detector.go	0.00%	4 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #4387 +/- ## ========================================== - Coverage 51.87% 51.85% -0.02% ========================================== Files 243 243 Lines 24114 24116 +2 ========================================== - Hits 12509 12506 -3 - Misses 10923 10927 +4 - Partials 682 683 +1 ``` | [Flag](https://app.codecov.io/gh/karmada-io/karmada/pull/4387/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=karmada-io) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/karmada-io/karmada/pull/4387/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=karmada-io) | `51.85% <0.00%> (-0.02%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=karmada-io#carryforward-flags-in-the-pull-request-comment) to find out more.

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[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

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