docs: provider and distro codegen migration (#3531)

# What does this PR do?

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<!-- Closes #[issue-number] -->

- Updates provider and distro codegen to handle the new format
- Migrates provider and distro files to the new format

## Test Plan

- Manual testing

<!-- Describe the tests you ran to verify your changes with result summaries. *Provide clear instructions so the plan can be easily re-executed.* -->

docs/source/providers/inference/remote_openai.md

@@ -1,21 +0,0 @@
-# remote::openai
-
-## Description
-
-OpenAI inference provider for accessing GPT models and other OpenAI services.
-
-## Configuration
-
-| Field | Type | Required | Default | Description |
-|-------|------|----------|---------|-------------|
-| `api_key` | `str \| None` | No |  | API key for OpenAI models |
-| `base_url` | `<class 'str'>` | No | https://api.openai.com/v1 | Base URL for OpenAI API |
-
-## Sample Configuration
-
-```yaml
-api_key: ${env.OPENAI_API_KEY:=}
-base_url: ${env.OPENAI_BASE_URL:=https://api.openai.com/v1}
-
-```
-