Clean up remove_ignored_trait_bounds_from_predicates #6427

Job	Run time
fmt	1m 8s
smoke-test-and-release-linux	6m 39s
smoke-test-and-release-windows	7m 8s
smoke-test-and-release-macos-x86	13m 6s
test-and-release-macos	16m 19s
test-and-release-macos (record-history)	3m 23s
test-and-release-macos (no-std)	5m 15s
test-and-release-macos (no-alloc)	3m 27s
test-and-release-macos (singular)	3m 3s
test-and-release-macos (cvc5)	2m 36s
release	24s
	1h 2m 28s

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