Refactor: remove initializer

[chivalryq]

Description of your changes

Fixes #2347

I have:

• Read and followed KubeVela's contribution process.
• Related Docs updated properly. In a new feature or configuration option, an update to the documentation is necessary.
• Run make reviewable to ensure this PR is ready for review.
• Added backport release-x.y labels to auto-backport this PR if necessary.

How has this code been tested

Special notes for your reviewer

[codecov]

Codecov Report

Merging #2491 (bc5c5c6) into master (1801471) will decrease coverage by 0.22%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #2491      +/-   ##
==========================================
- Coverage   52.12%   51.90%   -0.23%     
==========================================
  Files         224      221       -3     
  Lines       23293    23024     -269     
==========================================
- Hits        12142    11950     -192     
+ Misses       9726     9665      -61     
+ Partials     1425     1409      -16     

Flag	Coverage Δ
apiserver-unittests	25.53% <ø> (ø)
core-unittests	46.63% <ø> (+0.03%)	⬆️
e2e-multicluster-test	21.06% <0.00%> (+0.12%)	⬆️
e2e-rollout-tests	31.28% <0.00%> (+0.42%)	⬆️
e2etests	37.14% <0.00%> (-0.52%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
apis/core.oam.dev/v1beta1/register.go	92.85% <ø> (-0.48%)	⬇️
apis/core.oam.dev/v1beta1/zz_generated.deepcopy.go	42.64% <ø> (+0.01%)	⬆️
pkg/controller/core.oam.dev/v1alpha2/setup.go	36.00% <0.00%> (-2.47%)	⬇️
pkg/controller/utils/utils.go	40.19% <ø> (-4.55%)	⬇️
pkg/webhook/core.oam.dev/register.go	48.38% <ø> (-0.10%)	⬇️
...aits/traitdefinition/traitdefinition_controller.go	70.52% <0.00%> (-7.37%)	⬇️
...ponentdefinition/componentdefinition_controller.go	80.00% <0.00%> (-5.56%)	⬇️
...ler/core.oam.dev/v1alpha2/application/generator.go	77.35% <0.00%> (-1.89%)	⬇️
...ller/core.oam.dev/v1alpha2/application/revision.go	72.72% <0.00%> (-0.76%)	⬇️
pkg/oam/util/helper.go	72.92% <0.00%> (-0.49%)	⬇️
... and 4 more

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[wonderflow]

good job

[yangsoon]

lgtm