[typescript-angular] Include OIDC credential headers

[rgroothuijsen]

When OIDC security is defined, the authorization header is not included in the request. This is addressed by adding it in the same way that was used for OAuth.

Fixes #21245

@TiFu @taxpon @sebastianhaas @kenisteward @Vrolijkx @macjohnny @topce @akehir @petejohansonxo @amakhrov @davidgamero @mkusaka @joscha @dennisameling

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Summary by cubic

Adds the missing Authorization header for OpenID Connect in the TypeScript Angular generator, matching the existing OAuth behavior. Fixes requests that omitted the Bearer token when OIDC security is defined (fixes #21245).

• Bug Fixes
  • Set Authorization: Bearer header for OpenID schemes in api.service.mustache.
  • Added test (testOpenIdCredentialsAreSet) with a 3.1 spec to verify header generation.

^{Written for commit e60384c. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 3 files

[wing328]

lgtm. thanks for the contribution