chore(ci): update labels automation

[mloiseleur]

What does it do ?

Automatically set a label on each root directory

Motivation

Follow-up of #5481.
Easier PR review / triage.

More

• Yes, this PR title follows Conventional Commits
• Yes, I added unit tests
• Yes, I updated end user documentation accordingly

[ivankatliarchuk]

The filters in global file should just work

filters:
  "controller$":
    labels:
    -controller
  "source$":
      labels:
      -source

Example from kubernetes https://github.com/kubernetes/kubernetes/blob/6ed5b60f71930d51bfcf8bfa6f3506b099811318/OWNERS#L4

[AndrewCharlesHay]

/lgtm

[mloiseleur]

The filters in global file should just work

filters:
  "controller$":
    labels:
    -controller
  "source$":
      labels:
      -source

Example from kubernetes https://github.com/kubernetes/kubernetes/blob/6ed5b60f71930d51bfcf8bfa6f3506b099811318/OWNERS#L4

@ivankatliarchuk It does not work when labels are sets with sub OWNERS file. We are in this case, mainly for the Chart.
That's why I opened previous PR, #5481, some labels were configured and not applied.

[mloiseleur]

@ivankatliarchuk I'll let you merge this PR or leave me an other comment if you think there is a better way.

[ivankatliarchuk]

/lgtm
/approve

[k8s-ci-robot]

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