fix cache manager panic in yurthub

[rambohe-ch]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line: /kind bug /kind documentation /kind enhancement /kind good-first-issue /kind feature /kind question /kind design /sig ai /sig iot /sig network /sig storage

/kind bug

What this PR does / why we need it:

background:

yurt-hub-cfg configmap is used in multiple places, like:

• https://github.com/openyurtio/openyurt/blob/master/pkg/yurthub/cachemanager/cache_agent.go#L72
• https://github.com/openyurtio/openyurt/blob/master/pkg/yurthub/filter/approver.go#L126

In the cache manager, configmap is read, but in the approver, configmap is modified, so a panic maybe triggered.

solution:

deepcopy configmap before modify to avoid panic.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

other Note

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues

Measures
0 Security Hotspots
No data about Coverage
0.1% Duplication on New Code

See analysis details on SonarCloud

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (3e5d8fc) 52.04% compared to head (3de0034) 52.34%. Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1950 +/- ## ========================================== + Coverage 52.04% 52.34% +0.30% ========================================== Files 174 173 -1 Lines 21213 21012 -201 ========================================== - Hits 11040 10999 -41 + Misses 9199 9062 -137 + Partials 974 951 -23 ``` | [Flag](https://app.codecov.io/gh/openyurtio/openyurt/pull/1950/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openyurtio) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/openyurtio/openyurt/pull/1950/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openyurtio) | `52.34% <100.00%> (+0.30%)` | :arrow_up: | 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=openyurtio#carryforward-flags-in-the-pull-request-comment) to find out more.

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[rambohe-ch]

/backport release-v1.4

[github-actions[bot]]

Successfully created backport PR for release-v1.4:

• 1951