Unconditionally install rustfmt #4291

Job	Run time
dist (ubuntu-24.04-arm, aarch64-unknown-linux-gnu)	2m 38s
bench	7m 11s
test (ubuntu-latest, riscv64gc-unknown-linux-gnu, gcc-riscv64-linux-gnu qemu-user)	5m 19s
dist (ubuntu-22.04, x86_64-unknown-linux-gnu)	2m 46s
dist (windows-latest, x86_64-pc-windows-gnu)	5m 15s
test (macos-15-intel, x86_64-apple-darwin)	26m 14s
test (ubuntu-latest, s390x-unknown-linux-gnu, gcc-s390x-linux-gnu qemu-user)	5m 26s
test_llvm	4m 5s
rustfmt	12s
test (ubuntu-latest, x86_64-unknown-linux-gnu)	12m 12s
test (macos-latest, aarch64-apple-darwin)	16m 2s
test (ubuntu-24.04-arm, aarch64-unknown-linux-gnu)	9m 24s
dist (windows-latest, x86_64-pc-windows-msvc)	4m 50s
dist (macos-15-intel, x86_64-apple-darwin)	4m 42s
test (windows-latest, x86_64-pc-windows-msvc)	18m 57s
test (windows-latest, x86_64-pc-windows-gnu)	28m 36s
dist (macos-latest, aarch64-apple-darwin)	3m 55s
release	11s
	2h 37m 55s

Provide feedback