Fix local tiller default enabled inconsistency

Merged Hordur Freyr Yngvason requested to merge fix-local-tiller-default-enabled into master

What does this MR do?

Fixes an inconsistency missed in !35562 (merged) where we set the feature flag to default enabled.

I added ~"Pick into 13.2" because the documentation was already changed, and the backend will use local Tiller regardless of the Helm app being installed or not.

Screenshots

Does this MR meet the acceptance criteria?

Conformity

Availability and Testing

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

  • [-] Label as security and @ mention @gitlab-com/gl-security/appsec
  • [-] The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
  • [-] Security reports checked/validated by a reviewer from the AppSec team
Edited by Hordur Freyr Yngvason