feat: Add Python Virtual Environment Support: Add k8s Gateway Configuration

[SarahAsad23]

What changes were proposed in this PR?

This PR is an extension of PR #4484, #4902, #5035, and #5069. It adds Kubernetes gateway routing and access control configurations.

Any related issues, documentation, discussions?

This change is part of ongoing efforts to support environment isolation and reproducibility within Texera. Related issue includes #4296. This PR closes sub-issue #5137.

How was this PR tested?

Tested manually.

Was this PR authored or co-authored using generative AI tooling?

Co-authored using: Claude Code (claude-opus-4-7)

[codecov-commenter]

Codecov Report

❌ Patch coverage is 62.50000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.15%. Comparing base (36f0b52) to head (661a04c).
⚠️ Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
...exera/service/resource/AccessControlResource.scala	71.42%	1 Missing and 1 partial ⚠️
...virtual-environment/virtual-environment.service.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5138      +/-   ##
============================================
- Coverage     43.18%   43.15%   -0.03%     
- Complexity     2209     2213       +4     
============================================
  Files          1045     1045              
  Lines         40261    40359      +98     
  Branches       4251     4269      +18     
============================================
+ Hits          17385    17417      +32     
- Misses        21805    21867      +62     
- Partials       1071     1075       +4     

Flag	Coverage Δ		*Carryforward flag
access-control-service	40.67% <71.42%> (+1.14%)	⬆️
agent-service	33.72% <ø> (ø)		Carriedforward from 36f0b52
amber	43.80% <ø> (-0.06%)	⬇️
computing-unit-managing-service	0.00% <ø> (ø)
config-service	0.00% <ø> (ø)
file-service	32.18% <ø> (ø)
frontend	34.07% <0.00%> (-0.01%)	⬇️
python	90.43% <ø> (ø)		Carriedforward from 36f0b52
workflow-compiling-service	56.81% <ø> (ø)

*This pull request uses carry forward flags. Click here to find out more.

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