implemented HPA for kube auth proxy

[resoluteCoder]

Description

Why HPA for kube-auth-proxy?
All user requests go through this auth proxy. Making it scalable prevents it from becoming a performance/availability bottleneck for the entire data science platform. Performance tested showing scaling 1→4 pods reduced P99 latency from 23ms→17ms at 2000 RPS.

Key benefits:

• High Availability: Min 2 replicas = no single point of failure for authentication
• Auto-scaling: Handles traffic spikes automatically (2-10 pods based on CPU)
• Better UX: Lower latency under load, no auth bottleneck as usage grows

JIRA: RHOAIENG-40627

How Has This Been Tested?

Screenshot or short clip

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.04%. Comparing base (2ef65da) to head (0252289).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
...ler/services/gateway/gateway_controller_actions.go	0.00%	3 Missing ⚠️
.../controller/services/gateway/gateway_controller.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2958      +/-   ##
==========================================
- Coverage   47.05%   47.04%   -0.02%     
==========================================
  Files         148      148              
  Lines       10438    10447       +9     
==========================================
+ Hits         4912     4915       +3     
- Misses       4980     4985       +5     
- Partials      546      547       +1     

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