fix: allow Azure OpenAI API version override

[Zakharden]

Description

Adds Azure OpenAI API version configuration support for the azureopenai provider.

The API version can now be set through:

• k8sgpt auth add --azureAPIVersion
• k8sgpt auth update --azureAPIVersion
• K8SGPT_AZURE_API_VERSION when running k8sgpt serve
• the persisted provider config

When present, the value is passed to the Azure OpenAI client configuration so users can opt into newer Azure OpenAI API versions without changing code.

Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed

Validated locally:

• GOCACHE=/private/tmp/k8sgpt-go-build go test ./cmd/auth ./cmd/serve
• GOCACHE=/private/tmp/k8sgpt-go-build go test ./pkg/ai

Additional Information

The pkg/ai test package uses local httptest servers, so it needs permission to bind a localhost listener in restricted environments.

[AlexsJones]

Thanks for this, please sign the DCO @Zakharden

[codecov]

Codecov Report

❌ Patch coverage is 97.70115% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 45.84%. Comparing base (173e4dc) to head (d4dd3dc).
⚠️ Report is 227 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/serve/serve.go	93.54%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1650       +/-   ##
===========================================
+ Coverage   34.76%   45.84%   +11.08%     
===========================================
  Files          94      121       +27     
  Lines        6342     7518     +1176     
===========================================
+ Hits         2205     3447     +1242     
+ Misses       4046     3836      -210     
- Partials       91      235      +144     

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[Zakharden]

Signed off the commit and added coverage around the Azure API version paths.

[Zakharden]

Rebased on current main and fixed the test mock compile break from the updated IAIConfig method set. Verified locally with GOCACHE=/private/tmp/k8sgpt-gocache GOMODCACHE=/private/tmp/k8sgpt-gomodcache go test ./cmd/auth ./cmd/serve ./pkg/ai.