fix(typescript): Remove oauthTokenOverride config flag - always enable token override

[tjb9dc]

Description

Refs #11029

Removes the oauthTokenOverride configuration flag from the TypeScript SDK generator. OAuth token override is now always enabled, allowing users to provide a pre-generated bearer token instead of client ID/secret without any configuration.

Link to Devin run: https://app.devin.ai/sessions/87ae4fc7de9144918bfe7cc550f5e0a0
Requested by: [email protected] (@tjb9dc)

Changes Made

• Removed oauthTokenOverride from TypescriptCustomConfigSchema (Zod schema)
• Removed oauthTokenOverride from SdkCustomConfig interface
• Removed config parsing/passing through the generator pipeline:
  • SdkGeneratorCli.ts
  • SdkGenerator.ts
  • BaseClientContextImpl.ts
  • SdkClientClassGenerator.ts
  • GeneratedSdkClientClassImpl.ts
  • BaseClientTypeGenerator.ts
  • AuthProvidersGenerator.ts
  • OAuthAuthProviderGenerator.ts
  • ReadmeConfigBuilder.ts
  • ReadmeSnippetBuilder.ts
• Hardcoded hasTokenOverride = true in OAuthAuthProviderGenerator.ts
• Always use OAuthAuthProvider.createInstance() instead of conditional instantiation
• README authentication section now always shows for OAuth APIs
• Added version 3.37.4 to versions.yml with changelog entry
• Removed token-override seed test fixtures that used the removed config flag

Updates Since Last Revision

• Fixed seed test failures by removing token-override fixtures from seed/ts-sdk/seed.yml
• Deleted generated output folders for oauth-client-credentials/token-override and oauth-client-credentials-environment-variables/token-override

Testing

• Lint checks pass (pnpm run check)
• Seed test fixtures updated to remove references to removed config

Human Review Checklist

• Verify that always enabling token override (removing the config flag) is the intended behavior
• Note: Java SDK still has oauthTokenOverride config - this PR only changes TypeScript as requested
• Note: The hasTokenOverride = true pattern is kept for minimal diff; could be simplified further in a follow-up

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