add APIVersion and Kind checks for helper.ToUnstructured()

[zach593]

What type of PR is this?

/kind bug

What this PR does / why we need it:

This issue blocks me to continue #6017.

In function helper.ToUnstructured(), karmada will convert other types of object to unstructured.Unstructured, but if object is missed TypeMeta, the generated unstructured.Unstructured will also missed APIVersion and Kind, of course in most of the time these are harmful.

Missing TypeMeta objects usually come from typed clients or objects that manually created in code.
In kubernetes issue kubernetes/client-go#541 talked about typed client , looks like these guys won't fix this.

This issue affected many tests, and caused some tests to falsely report success. I fixed all the affected code I could see, but there may be still some I haven't noticed. This may also have an impact in non-test code, which I need to confirm further.

After fixing all the affected codes, I think adding an APIVersion and Kind checks to helper.ToUnstructured() can prevent the impact from expanding further. However, this check obviously needs to be added after ensuring that all the affected codes have been modified to avoid causing a stronger impact.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 26.31579% with 14 lines in your changes missing coverage. Please review.

Project coverage is 48.23%. Comparing base (72b6bd7) to head (3afc187).
Report is 12 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/scheduler/event_handler.go	27.27%	6 Missing and 2 partials ⚠️
pkg/util/helper/unstructured.go	25.00%	4 Missing and 2 partials ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6028      +/-   ##
==========================================
- Coverage   48.37%   48.23%   -0.15%     
==========================================
  Files         665      666       +1     
  Lines       54836    54843       +7     
==========================================
- Hits        26526    26451      -75     
- Misses      26592    26681      +89     
+ Partials     1718     1711       -7     

Flag	Coverage Δ
unittests	48.23% <26.31%> (-0.15%)	⬇️

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[RainbowMango]

/assign