scheduler: allow to disable Controllers

[saintube]

Ⅰ. Describe what this PR does

• koord-scheduler
  • Allow to disable Controller plugins for the multi-scheduler scenario.

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

V. Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in make test

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 32 lines in your changes missing coverage. Please review.

Project coverage is 65.89%. Comparing base (376c3c3) to head (ca08336).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/scheduler/frameworkext/controllers.go	0.00%	25 Missing ⚠️
...heduler/frameworkext/framework_extender_factory.go	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2452      +/-   ##
==========================================
- Coverage   65.93%   65.89%   -0.05%     
==========================================
  Files         472      472              
  Lines       55735    55762      +27     
==========================================
- Hits        36750    36744       -6     
- Misses      16336    16367      +31     
- Partials     2649     2651       +2     

Flag	Coverage Δ
unittests	65.89% <0.00%> (-0.05%)	⬇️

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[ZiMengSheng]

/lgtm

[koordinator-bot]

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