feat: check policy validity to prevent duplicate check #2103

Job	Run time
Docs - stable toolchain (recent)	33s
Embedded	1m 11s
Bench - nightly toolchain (recent)	1m 6s
Docs - nightly toolchain (recent)	39s
Format - nightly toolchain	14s
Integration tests - stable toolchain (26_0)	45s
Test - 1.63.0 toolchain (minimal)	26m 13s
Integration tests - stable toolchain (25_2)	1m 2s
Lint - nightly toolchain (recent)	40s
Test - 1.63.0 toolchain (recent)	26m 33s
Test - nightly toolchain (minimal)	14m 47s
Integration tests - stable toolchain (25_1)	48s
Test - nightly toolchain (recent)	13m 44s
Integration tests - stable toolchain (25_0)	1m 12s
Test - stable toolchain (minimal)	15m 48s
Integration tests - stable toolchain (24_2)	49s
Test - stable toolchain (recent)	16m 26s
Integration tests - stable toolchain (24_1)	49s
Integration tests - stable toolchain (24_0_1)	1m 16s
Integration tests - stable toolchain (23_2)	56s
Integration tests - stable toolchain (23_1)	1m 26s
Integration tests - stable toolchain (23_0)	1m 24s
Integration tests - stable toolchain (22_1)	1m 31s
Integration tests - stable toolchain (22_0)	1m 12s
Integration tests - stable toolchain (0_21_2)	1m 28s
Integration tests - stable toolchain (0_20_2)	1m 7s
Integration tests - stable toolchain (0_19_1)	1m 18s
Integration tests - stable toolchain (0_18_1)	1m 30s
Integration tests - stable toolchain (0_17_1)	1m 24s
	2h 17m 51s

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