[type:fix][ISSUE #5332] Fix restart plugin.

[YxYL6125]

Fixes https://github.com/apache/shenyu/issues/5332 & https://github.com/apache/shenyu/issues/5292

changes:

• add remove cache logic when closing plugin in class AbstractLogPluginDataHandler.

Make sure that:

• [x] You have read the contribution guidelines.
• [x] You submit test cases (unit or integration tests) that back your changes.
• [x] Your local test passed ./mvnw clean install -Dmaven.javadoc.skip=true.

[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (2f017d3) 61.84% compared to head (c6b64d9) 61.75%. Report is 1 commits behind head on master.

Files	Patch %	Lines
...java/org/apache/shenyu/common/utils/Singleton.java	0.00%	2 Missing :warning:
...g/common/handler/AbstractLogPluginDataHandler.java	0.00%	1 Missing :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5337      +/-   ##
============================================
- Coverage     61.84%   61.75%   -0.09%     
+ Complexity     8689     8680       -9     
============================================
  Files          1255     1255              
  Lines         38348    38350       +2     
  Branches       3673     3670       -3     
============================================
- Hits          23717    23684      -33     
- Misses        12518    12542      +24     
- Partials       2113     2124      +11     

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[moremind]

not right

[moremind]

#5332 because ext plugin has been removed from plugins cache

[YxYL6125]

#5332 because ext plugin has been removed from plugins cache

It is, my negligence :sweat_drops: