feat: add template for quota policy rl server and service

[aabchoo]

Description

Helm template to create quota policy rate limit server and service. The template is derived from the backend_quota_ratelimit.yaml. Guarded by a feature flag

Related to #2177

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.50%. Comparing base (1db3a15) to head (33f5a90).
⚠️ Report is 63 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2214   +/-   ##
=======================================
  Coverage   84.50%   84.50%           
=======================================
  Files         144      144           
  Lines       21055    21055           
=======================================
  Hits        17792    17792           
  Misses       2188     2188           
  Partials     1075     1075           

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[aabchoo]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces a Helm template and default configuration values for deploying a quota-based rate limiter service for the AI Gateway. The feedback highlights opportunities to improve the Helm chart's flexibility and correctness, including fixing a cut-off comment in the deployment template, using the tpl function to evaluate template expressions within environment variables, and replacing a hardcoded namespace with {{ .Release.Namespace }} for dynamic resolution.

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