koord-scheduler: set Reservation indexer before informer start to avoid error

[tzzcfrank]

Ⅰ. Describe what this PR does

If there is a new plugin that also starts the reservation informer during initialization, it will cause the reservation plugin to fail to register the indexer internally. The reason is that the k8s scheduling framework does not guarantee that the plugins are initialized in the order of configuration, even if the reservation plugin is configured first.

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

Base: 67.59% // Head: 67.52% // Decreases project coverage by -0.08% ⚠️

Coverage data is based on head (1ce2c14) compared to base (2b0f745).
Patch coverage: 39.47% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #996      +/-   ##
==========================================
- Coverage   67.59%   67.52%   -0.08%     
==========================================
  Files         247      249       +2     
  Lines       28174    28190      +16     
==========================================
- Hits        19043    19034       -9     
- Misses       7829     7851      +22     
- Partials     1302     1305       +3     

Flag	Coverage Δ
unittests	67.52% <39.47%> (-0.08%)	⬇️

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

Impacted Files	Coverage Δ
pkg/scheduler/frameworkext/indexer/add_indexer.go	0.00% <0.00%> (ø)
pkg/scheduler/plugins/reservation/plugin.go	80.73% <ø> (+0.29%)	⬆️
pkg/scheduler/plugins/reservation/utils.go	78.57% <ø> (-0.71%)	⬇️
pkg/scheduler/frameworkext/framework_extender.go	57.60% <40.00%> (-1.42%)	⬇️
pkg/scheduler/plugins/reservation/hook.go	75.62% <50.00%> (ø)
pkg/scheduler/frameworkext/indexer/reservation.go	52.38% <52.38%> (ø)
...cheduler/plugins/reservation/garbage_collection.go	82.01% <100.00%> (ø)
pkg/koordlet/runtimehooks/reconciler/reconciler.go	61.76% <0.00%> (-4.12%)	⬇️
pkg/util/httputil/reverseproxy.go	85.10% <0.00%> (+0.26%)	⬆️

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[saintube]

/lgtm

[eahydra]

/lgtm
/approve

[FillZpp]

Thanks!

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: eahydra, FillZpp

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Needs approval from an approver in each of these files:

• cmd/OWNERS [FillZpp]
• pkg/scheduler/OWNERS [eahydra]

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