util: optimize informers transformers

[dongjiang1989]

Ⅰ. Describe what this PR does

The optimization has been inspired by https://github.com/cert-manager/cert-manager/pull/5966

By stripping the rest of the metadata, we can save a bit of memory on clusters with lots of pods.

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

V. Checklist

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

[codecov[bot]]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (93f2bc2) 67.52% compared to head (58125df) 67.53%.

Files	Patch %	Lines
pkg/util/transformer/metadata_transformer.go	45.83%	11 Missing and 2 partials :warning:

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1736   +/-   ##
=======================================
  Coverage   67.52%   67.53%           
=======================================
  Files         413      414    +1     
  Lines       46072    46096   +24     
=======================================
+ Hits        31111    31131   +20     
- Misses      12705    12708    +3     
- Partials     2256     2257    +1     

Flag	Coverage Δ
unittests	67.53% <45.83%> (+<0.01%)	:arrow_up:

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[dongjiang1989]

Maybe golangci-lint timeout？

[eahydra]

@dongjiang1989 Hi, the transformers are now only used by the scheduler. If you want to apply the same functionality in koord-manager and koordlet, you should update more codes.

[dongjiang1989]

@dongjiang1989 Hi, the transformers are now only used by the scheduler. If you want to apply the same functionality in koord-manager and koordlet, you should update more codes.

Thanks for your review. Code update immediately!

[koordinator-bot[bot]]

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[ZiMengSheng]

/milestone 1.5

[koordinator-bot[bot]]

@ZiMengSheng: The provided milestone is not valid for this repository. Milestones in this repository: [someday, v1.4, v1.5]

Use /milestone clear to clear the milestone.

In response to this:

/milestone 1.5

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[ZiMengSheng]

/milestone v1.5

[dongjiang1989]

@eahydra Please re-check

[songtao98]

/assign @ZiMengSheng