refactor(annotations): use common prefix to simplify filtering in informer transformers

[valerian-roche]

This PR is extracted from #5595.

What does it do ?

In order to filter annotations in informer transformers, this PR makes it more explicit that a common prefix is used. New prefixes can be added later-on if need be, but all annotations should be anchored in a known prefix.

Motivation

This change should avoid addition of annotations mistakenly not matching expected patterns in informers.
There is no change otherwise

More

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

[k8s-ci-robot]

Hi @valerian-roche. Thanks for your PR.

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[ivankatliarchuk]

/ok-to-test

[ivankatliarchuk]

/lgtm

[mloiseleur]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mloiseleur

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