koord-scheduler: protect reserve pod from being preempted

[KunWuLuan]

Now reserve pod can be preempt by real pods, but these reserve pods won't be deleted by preemptor because they don't exist on apiserver. It will cause problem when a real pod try to preempt a reserve pod, the real pod will never find the reserve pod being terminated.

[codecov]

Codecov Report

Base: 66.66% // Head: 66.48% // Decreases project coverage by -0.17% ⚠️

Coverage data is based on head (9e102fb) compared to base (59b7e90).
Patch coverage: 71.42% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #920      +/-   ##
==========================================
- Coverage   66.66%   66.48%   -0.18%     
==========================================
  Files         240      241       +1     
  Lines       27769    27946     +177     
==========================================
+ Hits        18513    18581      +68     
- Misses       7987     8087     +100     
- Partials     1269     1278       +9     

Flag	Coverage Δ
unittests	66.48% <71.42%> (-0.18%)	⬇️

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

Impacted Files	Coverage Δ
pkg/scheduler/plugins/reservation/plugin.go	80.43% <71.42%> (-0.40%)	⬇️
pkg/koordlet/util/node.go	11.23% <0.00%> (-30.44%)	⬇️
.../webhook/pod/validating/request_limit_validator.go	71.84% <0.00%> (-23.20%)	⬇️
pkg/koordlet/audit/event_logger.go	65.53% <0.00%> (-3.98%)	⬇️
pkg/koordlet/runtimehooks/reconciler/reconciler.go	65.88% <0.00%> (-1.18%)	⬇️
...er/framework/plugins/loadaware/utilization_util.go	88.35% <0.00%> (-1.13%)	⬇️
...duler/plugins/elasticquota/quota_overuse_revoke.go	70.05% <0.00%> (-0.53%)	⬇️
pkg/descheduler/evictions/evictions.go	90.81% <0.00%> (-0.28%)	⬇️
pkg/koordlet/audit/config.go	100.00% <0.00%> (ø)
pkg/koordlet/metrics/common.go	67.85% <0.00%> (ø)
... and 15 more

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[eahydra]

@saintube PTAL

[saintube]

/lgtm

[eahydra]

/lgtm
/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: eahydra

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