🐛 create migration cr after the cluster manager cr is applied

[zhujian7]

Summary

This PR will:

• add the ObservedGeneration field for the cluster manager Applied condition
• wait the current generation cluster manager is applied(Applied condition is true and the ObservedGeneration==Generation), then create the migration CR

Related issue(s)

Fixes #

[openshift-ci]

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[zhujian7]

/cc @qiujian16 @elgnay @xuezhaojun

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.55%. Comparing base (ff77abd) to head (198e17b).
Report is 149 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #389      +/-   ##
==========================================
+ Coverage   61.46%   61.55%   +0.08%     
==========================================
  Files         133      133              
  Lines       14086    14100      +14     
==========================================
+ Hits         8658     8679      +21     
+ Misses       4674     4669       -5     
+ Partials      754      752       -2     

Flag	Coverage Δ
unit	61.55% <100.00%> (+0.08%)	⬆️

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[elgnay]

To some extent, this PR #328 has already ensured the expected CRD DOES exist before creating a Migration CR.

• https://github.com/open-cluster-management-io/ocm/blob/main/pkg/operator/operators/clustermanager/controllers/migrationcontroller/migration_controller.go#L172
• https://github.com/open-cluster-management-io/ocm/blob/main/pkg/operator/operators/clustermanager/controllers/migrationcontroller/migration_controller.go#L221

[qiujian16]

this means we cannot remove webhooks or remove an api version in the same release with migration. I am not quite sure how to control this.

[openshift-merge-robot]

PR needs rebase.

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[github-actions]

This pull request is stale because it has been open for 120 days with no activity. After 14 days of inactivity, it will be closed. Remove the stable label to prevent this issue from being closed.