[release-2.15] Fix the problem of not being able to initialize preset plugins

[halo-dev-bot]

This is an automated cherry-pick of #5874

/assign JohnNiang

解决初始化时无法正常启用插件的问题

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[guqing]

/lgtm

[codecov]

Codecov Report

Attention: Patch coverage is 54.54545% with 25 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (release-2.15@98a4b12). Click here to learn what that means.

Files	Patch %	Lines
...rc/main/java/run/halo/app/plugin/SpringPlugin.java	0.00%	19 Missing ⚠️
...pp/core/extension/reconciler/PluginReconciler.java	50.00%	2 Missing and 2 partials ⚠️
...lo/app/core/extension/endpoint/PluginEndpoint.java	92.85%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##             release-2.15    #5883   +/-   ##
===============================================
  Coverage                ?   56.51%           
  Complexity              ?     3462           
===============================================
  Files                   ?      612           
  Lines                   ?    20473           
  Branches                ?     1413           
===============================================
  Hits                    ?    11570           
  Misses                  ?     8322           
  Partials                ?      581           

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[ruibaby]

/lgtm

[f2c-ci-robot]

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