feat: Clusterrole and Webhook update for RAG Engine

[bangqipropel]

Reason for Change:
Clusterrole and Webhook update for RAG Engine

Requirements

• added unit tests and e2e tests (if applicable).

Issue Fixed:

Notes for Reviewers:

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 29 lines in your changes missing coverage. Please review.

Project coverage is 54.95%. Comparing base (5c30038) to head (f3d58ec).
Report is 25 commits behind head on main.

Files with missing lines	Patch %	Lines
api/v1alpha1/ragengine_validation.go	0.00%	14 Missing ⚠️
pkg/webhooks/webhooks.go	0.00%	14 Missing ⚠️
api/v1alpha1/ragengine_default.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #619      +/-   ##
==========================================
- Coverage   58.18%   54.95%   -3.24%     
==========================================
  Files          30       33       +3     
  Lines        2987     3159     +172     
==========================================
- Hits         1738     1736       -2     
- Misses       1149     1322     +173     
- Partials      100      101       +1     

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