increase rama policy robustness

[sun-yuliang]

What type of PR is this?

Enhancements

What this PR does / why we need it:

Increase rama policy robustness for several cases.

Which issue(s) this PR fixes:

Special notes for your reviewer:

[codecov]

Codecov Report

Patch coverage: 51.80% and project coverage change: -0.71 ⚠️

Comparison is base (21d86d9) 51.30% compared to head (fa870bd) 50.60%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #117      +/-   ##
==========================================
- Coverage   51.30%   50.60%   -0.71%     
==========================================
  Files         318      385      +67     
  Lines       32418    36581    +4163     
==========================================
+ Hits        16632    18510    +1878     
- Misses      13840    15971    +2131     
- Partials     1946     2100     +154     

Flag	Coverage Δ
unittest	50.60% <51.80%> (-0.71%)	⬇️

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Impacted Files	Coverage Δ
cmd/base/context_fake.go	70.28% <ø> (ø)
cmd/katalyst-agent/app/agent/eviction.go	0.00% <0.00%> (ø)
pkg/agent/evictionmanager/endpoint/endpoint.go	0.00% <ø> (ø)
pkg/agent/qrm-plugins/advisorsvc/advisor_svc.pb.go	10.34% <ø> (ø)
...ins/cpu/dynamicpolicy/calculator/cpu_assignment.go	77.01% <ø> (ø)
...gins/cpu/dynamicpolicy/cpueviction/cpu_eviciton.go	0.00% <0.00%> (-63.25%)	⬇️
pkg/agent/qrm-plugins/cpu/dynamicpolicy/policy.go	43.49% <ø> (+5.15%)	⬆️
...nt/qrm-plugins/memory/dynamicpolicy/state/state.go	63.63% <ø> (-2.31%)	⬇️
...ins/memory/dynamicpolicy/state/state_checkpoint.go	48.05% <ø> (ø)
...rm-plugins/memory/dynamicpolicy/state/state_mem.go	74.76% <ø> (+0.79%)	⬆️
... and 197 more

... and 26 files with indirect coverage changes

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