ci: Add `concurrency` to top-level workflows #1792

Job	Run time
Build & test (ubuntu-latest, 1.74.0, debug)	7m 41s
Build & test (ubuntu-latest, stable, debug)	7m 41s
Build & test (ubuntu-latest, nightly, debug)	7m 28s
Build & test (macos-14, 1.74.0, debug)	6m 36s
Build & test (macos-14, stable, debug)	7m 57s
Build & test (macos-14, nightly, debug)	6m 33s
Build & test (windows-latest, 1.74.0, debug)	15m 38s
Build & test (windows-latest, stable, debug)	16m 21s
Build & test (windows-latest, nightly, debug)	15m 22s
Build & test (ubuntu-latest, stable, release)	8m 59s
Benchmark / Benchmark	7m 41s
	1h 47m 57s

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