scheduler: resolve the wrong use of gangmod in gang init phase

[PeterChg]

Ⅰ. Describe what this PR does

The use of pod and podgroup was confused during the gang init phase, result failed to update the GangMatchPolicy configuration

Ⅱ. Does this pull request fix one issue?

NONE

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

All modified and coverable lines are covered by tests ✅

Project coverage is 67.44%. Comparing base (3390433) to head (a0b58ed).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1934      +/-   ##
==========================================
- Coverage   67.45%   67.44%   -0.01%     
==========================================
  Files         420      420              
  Lines       46885    46885              
==========================================
- Hits        31626    31623       -3     
+ Misses      12962    12959       -3     
- Partials     2297     2303       +6     

Flag	Coverage Δ
unittests	67.44% <100.00%> (-0.01%)	⬇️

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[eahydra]

/lgtm
/cc @xulinfei1996 please take a look.

[xulinfei1996]

/lgtm

[hormes]

/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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