Improve import error suggestions #7026

Job	Run time
validate	12s
test (stable, x86_64-unknown-linux-gnu)	2m 59s
test-wasm	1m 27s
test (stable, x86_64-unknown-linux-musl)	5m 13s
rustfmt	7s
lint-build	49s
test (stable, aarch64-unknown-linux-gnu)	1m 52s
test (stable, aarch64-unknown-linux-musl)	2m 21s
test (stable, x86_64-apple-darwin)	7m 9s
test (stable, x86_64-pc-windows-msvc)	4m 49s
test (stable, aarch64-apple-darwin, macos-latest, false, true)	2m 39s
test-projects	1m 35s
	31m 12s

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