Add support for unparsable policies in experimental 'tolerant-ast' feature #3634

Job	Run time
Cargo SemVer Checks (stable)	5m 32s
build_and_test / Build and Test (stable)	13m 55s
build_and_test / cargo deny	19s
build_and_test / clippy (stable)	1m 15s
build_and_test / format (stable)	4s
build_and_test / msrv	2m 28s
build_and_test / run wasm build script (ubuntu-latest)	5m 52s
build_and_test / run wasm build script (macos-latest-large)	4m 52s
build_and_test / run wasm build script (macos-latest)	7m 10s
Check coverage criteria	23s
	41m 50s

Provide feedback