deprecate region headroom policies

[sun-yuliang]

What type of PR is this?

Chore

What this PR does / why we need it:

Remove region headroom policies because node headroom is updated in headroom assembler.

Which issue(s) this PR fixes:

Special notes for your reviewer:

[codecov]

Codecov Report

Patch coverage: 52.02% and project coverage change: -0.10 ⚠️

Comparison is base (21d86d9) 51.30% compared to head (ba05682) 51.20%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #111      +/-   ##
==========================================
- Coverage   51.30%   51.20%   -0.10%     
==========================================
  Files         318      375      +57     
  Lines       32418    36206    +3788     
==========================================
+ Hits        16632    18540    +1908     
- Misses      13840    15523    +1683     
- Partials     1946     2143     +197     

Flag	Coverage Δ
unittest	51.20% <52.02%> (-0.10%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cmd/katalyst-agent/app/agent/eviction.go	0.00% <0.00%> (ø)
...gent/app/options/dynamic/adminqos/adminqos_base.go	54.54% <ø> (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	43.73% <ø> (+5.38%)	⬆️
...ins/memory/dynamicpolicy/state/state_checkpoint.go	48.05% <0.00%> (ø)
...g/agent/qrm-plugins/network/staticpolicy/policy.go	52.97% <ø> (ø)
pkg/agent/qrm-plugins/network/staticpolicy/util.go	62.14% <ø> (ø)
... and 189 more

... and 13 files with indirect coverage changes

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