resource eviction ThresholdGetter support threshold not set

[luomingmeng]

What type of PR is this?

Bug fixes

What this PR does / why we need it:

ThresholdGetter of resource eviction support threshold not set

[codecov]

Codecov Report

Patch coverage: 72.72% and project coverage change: +0.25% 🎉

Comparison is base (268d46c) 52.86% compared to head (a1937c2) 53.11%.
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #264      +/-   ##
==========================================
+ Coverage   52.86%   53.11%   +0.25%     
==========================================
  Files         437      443       +6     
  Lines       42486    43027     +541     
==========================================
+ Hits        22460    22854     +394     
- Misses      17575    17688     +113     
- Partials     2451     2485      +34     

Flag	Coverage Δ
unittest	53.11% <72.72%> (+0.25%)	⬆️

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Files Changed	Coverage Δ
...gent/evictionmanager/plugin/reclaimed_resources.go	82.85% <66.66%> (ø)
pkg/agent/evictionmanager/plugin/resources.go	66.66% <75.00%> (-0.23%)	⬇️

... and 39 files with indirect coverage changes

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