[python] Fall back to wire type for unknown encode

[msyyc]

Description

This PR improves the handling of encode types in the Python emitter by falling back to the wire type when an unknown or unsupported encode is encountered, instead of silently ignoring it.

Changes

• Restructured the encode handling logic in emitBuiltInType for clarity
• Added explicit handling for duration with ISO8601 encode
• Added explicit handling for utcDateTime/offsetDateTime with unixTimestamp encode
• Added a fallback path that uses the wire type when the encode is not recognized, ensuring the emitted type is still correct

[github-actions]

All changed packages have been documented.

• ✅ @typespec/http-client-python

Show changes

@typespec/http-client-python - fix ✏️

Fall back to wire type for unknown or unsupported encode

[azure-sdk]

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commit: adbd97a