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: 4 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
tests/server/api/testutil.go	100.00% <100.00%> (ø)
server/schedule/scheduler.go	57.14% <66.66%> (+1.87%)	⬆️
server/cluster/coordinator.go	70.61% <0.00%> (-0.85%)	⬇️

... and 21 files with indirect coverage changes

📢 Thoughts on this report? Let us know!.

[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: df42d16