Account for unschedulable plugin result during maxreplica estimation

[mszacillo]

What type of PR is this?
/kind bug

What this PR does / why we need it:
Bugfix related to maxReplica estimation.

Testing

Local:

mszacillo@HXQDWP921L estimator % go test ./...
?   	github.com/karmada-io/karmada/pkg/estimator/client	[no test files]
?   	github.com/karmada-io/karmada/pkg/estimator/pb	[no test files]
?   	github.com/karmada-io/karmada/pkg/estimator/server/framework	[no test files]
?   	github.com/karmada-io/karmada/pkg/estimator/server/framework/plugins	[no test files]
?   	github.com/karmada-io/karmada/pkg/estimator/server/metrics	[no test files]
?   	github.com/karmada-io/karmada/pkg/estimator/server/nodes	[no test files]
?   	github.com/karmada-io/karmada/pkg/estimator/server/replica	[no test files]
?   	github.com/karmada-io/karmada/pkg/estimator/service	[no test files]
ok  	github.com/karmada-io/karmada/pkg/estimator/server	1.626s
ok  	github.com/karmada-io/karmada/pkg/estimator/server/framework/plugins/resourcequota	2.148s
ok  	github.com/karmada-io/karmada/pkg/estimator/server/framework/runtime	1.244s

E2E test with added logs:

I0601 16:19:48.700057       1 generic_scheduler.go:95] Feasible clusters scores: [{cluster-A 0} {cluster-B 0}]
I0601 16:19:48.700159       1 util.go:76] Running score for estimator: general-estimator
I0601 16:19:48.700212       1 general.go:77] cluster cluster-A has max available replicas: 8 according to cluster resource models
I0601 16:19:48.700234       1 general.go:77] cluster cluster-B has max available replicas: 8 according to cluster resource models
I0601 16:19:48.700257       1 util.go:83] Result for cluster: cluster-A was score 8
I0601 16:19:48.700270       1 util.go:83] Result for cluster: cluster-B was score 8
I0601 16:19:48.700282       1 util.go:76] Running score for estimator: scheduler-estimator
I0601 16:19:48.704222       1 util.go:83] Result for cluster: cluster-A was score 0
I0601 16:19:48.704248       1 util.go:83] Result for cluster: cluster-B was score 4
I0601 16:19:48.704253       1 util.go:101] Target cluster calculated by estimators (available cluster && maxAvailableReplicas): [{cluster-A 0} {cluster-B 4}]
I0601 16:19:48.704275       1 generic_scheduler.go:101] Selected clusters: [cluster-B]

Which issue(s) this PR fixes:
Fixes #5011

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

`karmada-scheduler-estimator`: Fixed the `Unschedulable` result returned by plugins to be treated as an exception issue.

[karmada-bot]

Welcome @mszacillo! It looks like this is your first PR to karmada-io/karmada 🎉

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 62.50000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 53.30%. Comparing base (c181917) to head (23c9dc9).
Report is 4 commits behind head on master.

Files	Patch %	Lines
pkg/estimator/server/estimate.go	0.00%	1 Missing and 1 partial ⚠️
pkg/scheduler/core/util.go	80.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5012      +/-   ##
==========================================
- Coverage   53.32%   53.30%   -0.03%     
==========================================
  Files         253      253              
  Lines       20560    20565       +5     
==========================================
- Hits        10964    10962       -2     
- Misses       8870     8876       +6     
- Partials      726      727       +1     

Flag	Coverage Δ
unittests	53.30% <62.50%> (-0.03%)	⬇️

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

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[whitewindmills]

/assign

[RainbowMango]

/assign

[RainbowMango]

/lgtm

@whitewindmills Do you have any further comments?

[whitewindmills]

others LGTM

[mszacillo]

Thanks for all the comments!

[RainbowMango]

/lgtm
I see comments have been addressed.
@whitewindmills would you like to take another look?

[whitewindmills]

/lgtm

[RainbowMango]

/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

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Needs approval from an approver in each of these files:

• pkg/estimator/OWNERS [RainbowMango]
• pkg/scheduler/OWNERS [RainbowMango]

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[RainbowMango]

@mszacillo Great thanks for helping fix this!
Just a suggestion that you might need to add your email to GitHub Emails, otherwise, GitHub can't recognize you and count your contributions.

[RainbowMango]

Filed an issue(#5024) to track the backport tasks.

[RainbowMango]

@mszacillo I didn't run the test locally, can you confirm if this patch works as expected?