refactor(transformer_conformance): skip plugins we don't support yet #8501

Job	Run time
Format	12s
Cargo Deny	4s
Check and Build (windows-latest)	1m 35s
Check and Build (ubuntu-latest)	34s
Spell Check	6s
Check Unused Dependencies	19s
Check and Build (macos-14)	47s
Check Wasm	1m 2s
Conformance	2m 19s
Doc	43s
Clippy	50s
Test (windows-latest)	2m 27s
Test (ubuntu-latest)	56s
Test (macos-14)	51s
	12m 45s

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