add migration for cluster user labels

[zreigz]

What this PR does / why we need it: add migration for cluster user labels. Some clusters still have not used user and user_RAW labels.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

add migration for cluster user labels

[alvaroaleman]

/lgtm
/approve
/cherrypick release/v2.12

[kubermatic-bot]

@alvaroaleman: once the present PR merges, I will cherry-pick it on top of release/v2.12 in a new PR and assign it to you.

In response to this:

/lgtm
/approve
/cherrypick release/v2.12

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[kubermatic-bot]

LGTM label has been added.

Git tree hash: df34aaeef258b02e27463c6a5d85142c0eaa252b

[kubermatic-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alvaroaleman, zreigz

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Needs approval from an approver in each of these files:

• api/pkg/crd/OWNERS [alvaroaleman]
• api/pkg/provider/kubernetes/OWNERS [zreigz]

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[zreigz]

/retest

[zreigz]

/retest

[zreigz]

/retest

[kubermatic-triage-bot]

/retest
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[kubermatic-bot]

@kubermatic-triage-bot:

In response to this:

/retest
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Review the full test history

Silence the bot with an /lgtm cancel or /hold comment for consistent failures.

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[zreigz]

/retest

[kubermatic-triage-bot]

/retest
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Review the full test history

Silence the bot with an /lgtm cancel or /hold comment for consistent failures.

Also, here is a cat.
/meow

[kubermatic-bot]

@kubermatic-triage-bot:

In response to this:

/retest
This bot automatically retries jobs that failed/flaked on approved PRs

Review the full test history

Silence the bot with an /lgtm cancel or /hold comment for consistent failures.

Also, here is a cat.
/meow

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[kubermatic-bot]

@alvaroaleman: #4744 failed to apply on top of branch "release/v2.12":

error: Failed to merge in the changes.
Using index info to reconstruct a base tree...
M	api/pkg/crd/migrations/migrations.go
M	api/pkg/provider/kubernetes/user.go
Falling back to patching base and 3-way merge...
Auto-merging api/pkg/provider/kubernetes/user.go
Auto-merging api/pkg/crd/migrations/migrations.go
CONFLICT (content): Merge conflict in api/pkg/crd/migrations/migrations.go
Patch failed at 0001 add migration for cluster user labels

In response to this:

/lgtm
/approve
/cherrypick release/v2.12

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.