ci: Only run one of each workflow at once for a branch / PR #4254

Job	Run time
cargo-build-test-cli	17m 34s
cargo-test-sbf	13m 3s
cargo-test-sbf-associated-token-account	7m 35s
cargo-test-sbf-transfer-hook	6m 39s
cargo-test-sbf-twoxtx	13m 54s
cargo-test-token-2022-serde	2m 58s
js-test	9m 3s
cargo-build-test-transfer-hook-cli	12m 43s
	1h 23m 29s

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