Track replica mode transition times with replicaTransitionTimeMap (backport #2685)

[mergify]

This is an automatic backport of pull request #2685 done by Mergify.
Cherry-pick of 65bdc09 has failed:

On branch mergify/bp/v1.5.x/pr-2685
Your branch is up to date with 'origin/v1.5.x'.

You are currently cherry-picking commit 65bdc091.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   controller/engine_controller.go
	modified:   controller/volume_controller.go
	modified:   datastore/longhorn.go
	modified:   k8s/crds.yaml
	modified:   k8s/pkg/apis/longhorn/v1beta2/engine.go
	modified:   k8s/pkg/apis/longhorn/v1beta2/replica.go
	modified:   k8s/pkg/apis/longhorn/v1beta2/zz_generated.deepcopy.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   upgrade/v153to154/upgrade.go

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[mergify]

Cherry-pick of 65bdc09 has failed:

On branch mergify/bp/v1.5.x/pr-2685
Your branch is up to date with 'origin/v1.5.x'.

You are currently cherry-picking commit 65bdc091.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   controller/engine_controller.go
	modified:   controller/volume_controller.go
	modified:   datastore/longhorn.go
	modified:   k8s/crds.yaml
	modified:   k8s/pkg/apis/longhorn/v1beta2/engine.go
	modified:   k8s/pkg/apis/longhorn/v1beta2/replica.go
	modified:   k8s/pkg/apis/longhorn/v1beta2/zz_generated.deepcopy.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   upgrade/v153to154/upgrade.go

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally