added overlay without namespace and fixed certs for custom namespace

[AndrewChubatiuk]

address issues #1315 and #279

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Summary by cubic

Adds a namespace-less overlay and moves cert-manager into a dedicated overlay with correct CA/DNS wiring. Updates manifests to use the new overlay so installs work in custom namespaces.

• New Features

  • Added base overlay without Namespace at config/base-without-namespace (deletes vm Namespace for custom setups).
  • Introduced config/default-with-certmanager that bundles webhook + cert-manager and applies CA injection/DNS replacements.
  • Simplified config/default-with-webhook to webhook-only; cert-manager no longer included there.

• Bug Fixes

  • Certificates now derive dnsNames and CA injection from the webhook Service name/namespace, fixing installs outside the vm namespace.

^{Written for commit fcf727f. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 5 files

_{Re-trigger cubic}

[vrutkovs]

I wonder if its easy to add some tests on this?

[AndrewChubatiuk]

I've just tried it locally, for testing probably some custom tools are needed, haven't seen any ready solution