feat: multinamespace name config

[imkira]

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What issue type does this pull request address? (keep at least one, remove the others) /kind enhancement /kind feature

What does this pull request do? Which issues does it resolve? (use resolves #<issue_number> if possible)

Support more flexible namespace naming format in the multi name space mode via configuration.

Please provide a short message that should be published in the vcluster release notes Added more flexible namespace format (prefix, base, suffix) in multi-namespace mode

What else do we need to know?

This is part of a collaborative work at Woven by Toyota with my colleagues @ajithcnambiar and @tauxi

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[heiko-braun]

Thanks @imkira , would you mind to rebase this one?

[imkira]

@heiko-braun Hey, thanks for reaching out. Yes, I did the rebase. PTAL.

[imkira]

@heiko-braun I rebased again (and worked through some conflicts). Could you please take another look and consider the merge? Thank you.