Fix a lot of `unused_qualifications` lints #2593

Job	Run time
minimal	17s
docs	25s
rustfmt-clippy	28s
msrv	59s
check-cfg	21s
quickchecking	22s
test (ubuntu-latest, 9.0, 1, 0, 0, 0, 0)	1m 41s
test-book	7s
test (ubuntu-latest, 9.0, 1, 0, 0, 1, 0)	1m 52s
test-expectations (ubuntu-latest)	54s
test (ubuntu-latest, 9.0, 1, 0, 1, 0, 0)	1m 44s
test-expectations (macos-12)	1m 9s
test (ubuntu-latest, 9.0, 1, 0, 1, 1, 0)	2m 25s
test (ubuntu-latest, 9.0, 1, 1, 0, 0, 0)	2m 12s
test (ubuntu-latest, 9.0, 1, 1, 0, 1, 0)	2m 19s
test (ubuntu-latest, 9.0, 1, 1, 1, 0, 0)	2m 14s
test (ubuntu-latest, 9.0, 1, 1, 1, 1, 0)	2m 16s
test (ubuntu-latest, 16.0, 1, 0, 0, 0, 0)	3m 47s
test (ubuntu-latest, 16.0, 1, 0, 0, 1, 0)	4m 32s
test (ubuntu-latest, 16.0, 1, 0, 1, 0, 0)	3m 56s
test (ubuntu-latest, 16.0, 1, 0, 1, 1, 0)	4m 1s
test (ubuntu-latest, 16.0, 1, 1, 0, 0, 0)	4m 54s
test (ubuntu-latest, 16.0, 1, 1, 0, 1, 0)	4m 54s
test (ubuntu-latest, 16.0, 1, 1, 1, 0, 0)	5m 3s
test (ubuntu-latest, 16.0, 1, 1, 1, 1, 0)	4m 41s
test (ubuntu-latest, 16.0, 0, 0, 1)	1m 42s
test (macos-12, 9.0, 0, 0, 0)	1m 33s
success	1s
	1h 0m 49s

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