refactor(abstract-utxo): narrow descriptor PSBT type unions to wasm-only #2864

Job	Run time
Generate merge base API spec	8m 59s
Generate head API spec	7m 55s
Check specs identical	8s
Linter Override	0s
Check breaking changes	0s
API Spec Check	2s
Generate vacuum reports for API spec	0s
	17m 4s

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