scheduler: fix scheduler save config (#7108)

[ti-chi-bot]

This is an automated cherry-pick of #7108

What problem does this PR solve?

Issue Number: Close #6897

What is changed and how does it work?

Nowadays we have 2 configs setting way
We need to make sure that create just means create and not further save the configuration

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• nolouch
• rleungx

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[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
pkg/mock/mockcluster/mockcluster.go	94.74% <100.00%> (ø)
pkg/schedule/placement/rule_manager.go	85.89% <100.00%> (-0.41%)	⬇️
pkg/schedule/schedulers/evict_leader.go	81.28% <ø> (ø)
server/cluster/cluster.go	81.33% <100.00%> (ø)
server/config/persist_options.go	92.59% <100.00%> (+0.69%)	⬆️
tests/server/api/testutil.go	100.00% <100.00%> (ø)
pkg/schedule/scheduler.go	57.14% <66.66%> (+1.87%)	⬆️
server/cluster/coordinator.go	73.38% <0.00%> (-0.40%)	⬇️
server/server.go	73.79% <40.00%> (-0.51%)	⬇️

... and 25 files with indirect coverage changes

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[nolouch]

/merge

[ti-chi-bot]

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: c1fb36e