Revert "Add create requestOpts method to {{classname}}Interface #21708"

[macjohnny]

Reverts #21709

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Summary by cubic

Reverts the addition of RequestOpts builder methods in the typescript-fetch generator and restores the previous API that executes requests via Raw/typed methods. This removes {{nickname}}RequestOpts from interfaces and clients and updates templates and samples to the prior behavior.

• Refactors

  • Removed {{nickname}}RequestOpts from {{classname}}Interface and generated API classes.
  • Restored {{nickname}}Raw methods to send requests and return runtime.ApiResponse.
  • Updated typescript-fetch apis.mustache and all petstore samples to match the previous API.

• Migration

  • Replace calls to XRequestOpts(...) with XRaw(...), passing initOverrides to customize RequestInit.
  • Use typed methods (e.g., X(...)) if you don’t need the raw response.

^{Written for commit 5b97b9a. Summary will update on new commits.}

[cubic-dev-ai]

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