`npx remotion lambda render` does not derive the codec from the file extension #1248

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Acceptance criteria:

• Should handle npx remotion lambda render [serve-url] [comp-name] --out-name=out.mp3 (higher priority)
• Should handle npx remotion lambda render [serve-url] [comp-name] out.mp3
• Should error when a conflicting setting is used npx remotion lambda render [serve-url] [comp-name] --out-name=out.mp3 --codec=gif, reuse code from packages/renderer/src/validate-output-filename.ts
  • Ideally: Add this validation to renderMediaOnLambda() as well to catch the same error when using Node.JS APIs
• Should derive .png / .jpeg codec when using npx remotion lambda still (same logic as here: https://github.com/remotion-dev/remotion/blob/33668831b0335fcf1ff5580e53046dad97ff6273/packages/cli/src/still.ts#L42)
  • Ideally: Add this validation to renderMediaOnLambda() as well to catch the same error when using Node.JS APIs

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