scheduler: fix monitor terminating pod

[saintube]

Ⅰ. Describe what this PR does

scheduler: Fix a bug where the pod is leaked in the schedulerMonitor's cache if it is terminating and then dequeues.

Ⅱ. Does this pull request fix one issue?

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 66.06%. Comparing base (cc55177) to head (3fa4257).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2331      +/-   ##
==========================================
+ Coverage   66.05%   66.06%   +0.01%     
==========================================
  Files         464      464              
  Lines       54643    54651       +8     
==========================================
+ Hits        36092    36104      +12     
+ Misses      15943    15940       -3     
+ Partials     2608     2607       -1     

Flag	Coverage Δ
unittests	66.06% <100.00%> (+0.01%)	⬆️

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