feat: add Nodeclaim/Machine provision to RAG Engine controller

[bangqipropel]

Reason for Change:

1. add Nodeclaim/Machine provision to RAG Engine controller
2. add status changes to RAG Engine controller
3. change the corresponding webhook, tests and so on
4. reorg the duplicate codes between RAG Engine and workspace

Requirements

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

Issue Fixed:

Notes for Reviewers:

[codecov]

Codecov Report

Attention: Patch coverage is 43.18707% with 246 lines in your changes missing coverage. Please review.

Project coverage is 53.43%. Comparing base (5c30038) to head (e06afb7).
Report is 23 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/controllers/ragengine_controller.go	27.67%	150 Missing and 12 partials ⚠️
pkg/nodeclaim/nodeclaim.go	63.49%	23 Missing ⚠️
pkg/machine/machine.go	64.00%	18 Missing ⚠️
api/v1alpha1/ragenging_validation.go	0.00%	14 Missing ⚠️
pkg/webhooks/webhooks.go	0.00%	14 Missing ⚠️
pkg/controllers/workspace_controller.go	58.62%	12 Missing ⚠️
pkg/controllers/ragengine_status.go	94.73%	1 Missing and 1 partial ⚠️
api/v1alpha1/ragengine_default.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #616      +/-   ##
==========================================
- Coverage   58.18%   53.43%   -4.75%     
==========================================
  Files          30       34       +4     
  Lines        2987     3503     +516     
==========================================
+ Hits         1738     1872     +134     
- Misses       1149     1517     +368     
- Partials      100      114      +14     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[zhuangqh]

the same logic as https://github.com/Azure/kaito/blob/main/pkg/controllers/workspace_controller.go#L374