fix(gooddata-sdk): [AUTO] Fix OpenAI baseUrl non-nullable with default https://api.openai.com/v1

[yenkins-admin]

Updates CatalogOpenAiProviderConfig.base_url to non-nullable str with default https://api.openai.com/v1, aligning the SDK wrapper with the updated OpenAPI spec from gdc-nas.

P002 | Workflow: https://github.com/gooddata/gdc-nas/actions/runs/22995241596

What changed in gdc-nas

• PR #21102 (commit 5dad98f): Makes OpenAIProviderConfig.baseUrl non-nullable (String? → String) and updates the default from https://api.openai.com to https://api.openai.com/v1. Removes nullable: true from both OpenAPI specs (afm-exec-api and metadata-api). All fixture JSON files updated accordingly. Non-2xx responses from OpenAI are now treated as unreachable.

• PR #21200 (commit b6eb1a4): Raises MAX_MODELS_PER_PROVIDER from 5 to 20 — server-side constraint only, no SDK wrapper impact.

What was implemented in SDK

• Changed CatalogOpenAiProviderConfig.base_url type from str | None = None to str = "https://api.openai.com/v1" to match the updated OpenAPI spec where baseUrl is now non-nullable.
• Updated _provider_config_from_api to fall back to https://api.openai.com/v1 when baseUrl is absent in the API response, ensuring consistent behavior after the server-side change that guarantees a non-null value.

Files modified

• packages/gooddata-sdk/src/gooddata_sdk/catalog/organization/entity_model/llm_provider.py

JIRA: PENDING (Jira ticket will be created after review)
Risk: Low

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.53%. Comparing base (46c0f4b) to head (527b4f9).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1404   +/-   ##
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  Coverage   77.53%   77.53%           
=======================================
  Files         225      225           
  Lines       14614    14614           
=======================================
  Hits        11331    11331           
  Misses       3283     3283           

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