sidecarSet initContainer support InjectPolicy

[zmberg]

Ⅰ. Describe what this PR does

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 49.01%. Comparing base (0d0031a) to head (8482b05). Report is 37 commits behind head on master.

Files	Patch %	Lines
...set/validating/sidecarset_create_update_handler.go	0.00%	2 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1617      +/-   ##
==========================================
+ Coverage   47.91%   49.01%   +1.09%     
==========================================
  Files         162      180      +18     
  Lines       23491    18804    -4687     
==========================================
- Hits        11256     9217    -2039     
+ Misses      11014     8375    -2639     
+ Partials     1221     1212       -9     

Flag	Coverage Δ
unittests	49.01% <50.00%> (+1.09%)	:arrow_up:

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[furykerry]

/lgtm /approve

[kruise-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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