Helm: Add field for Webhook namespace selector

[Volatus]

Issue

Fixes #2572

Description

Adds the config option webhookNamespaceSelectors so that the user is able to specify a different one than the default.

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the docs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[k8s-ci-robot]

Hi @Volatus. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[Volatus]

/kind feature
/ok-to-test
/cc @kishorj

[k8s-ci-robot]

@Volatus: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/kind feature
/ok-to-test
/cc @kishorj

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.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.99%. Comparing base (d8ee617) to head (58d6de9).
Report is 670 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@ ## main #2724 +/- ## ======================================= Coverage 53.99% 53.99% ======================================= Files 144 144 Lines 8214 8214 ======================================= Hits 4435 4435 Misses 3461 3461 Partials 318 318 

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[kishorj]

/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kishorj, Volatus

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Needs approval from an approver in each of these files:

• OWNERS [kishorj]

Approvers can indicate their approval by writing /approve in a comment
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[kishorj]

/lgtm

[Volatus]

/retest