experiment: introduce generate manifest policy

[marionebl]

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
• The title of the PR conforms to the Title of the PR
• I've included "Closes [ISSUE #]" or "Fixes [ISSUE #]" in the description to automatically close the associated issue.
• I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• Does this PR require documentation updates?
• I've updated documentation as required by this PR.
• I have signed off all my commits as required by DCO
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My build is green (troubleshooting builds).
• My new feature complies with the feature status guidelines.
• I have added a brief description of why this PR is necessary and/or what this PR solves.
• Optional. My organization is added to USERS.md.
• Optional. For bug fixes, I've indicated what older releases this fix should be cherry-picked into (this may or may not happen depending on risk/complexity).

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[codecov]

Codecov Report

❌ Patch coverage is 81.37255% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.02%. Comparing base (f1c5201) to head (2f6dee2).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
util/settings/settings.go	16.66%	4 Missing and 1 partial ⚠️
reposerver/repository/pathboundary.go	92.00%	2 Missing and 2 partials ⚠️
reposerver/repository/repository.go	70.00%	2 Missing and 1 partial ⚠️
util/webhook/webhook.go	70.00%	2 Missing and 1 partial ⚠️
controller/state.go	84.61%	1 Missing and 1 partial ⚠️
reposerver/repository/utils.go	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #26814      +/-   ##
==========================================
+ Coverage   62.93%   63.02%   +0.08%     
==========================================
  Files         414      416       +2     
  Lines       56152    56244      +92     
==========================================
+ Hits        35340    35448     +108     
+ Misses      17450    17424      -26     
- Partials     3362     3372      +10     

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