Target declaration refactor #1238

Job	Run time
Lint	5m 41s
Compiletest (macOS-latest)	9m 48s
Compiletest (ubuntu-24.04)	8m 1s
Test (ubuntu-24.04)	11m 23s
Difftest (ubuntu-24.04)	14m 14s
Difftest (macOS-latest)	19m 2s
Difftest (windows-2022)	24m 45s
Android (ubuntu-24.04, aarch64-linux-android)	8m 20s
Compiletest (windows-2022)	16m 34s
Test (macOS-latest)	20m 59s
cargo-deny	1m 20s
Test (windows-2022)	18m 58s
test_success	4s
	2h 39m 9s

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