Improve witness/mirror policy backwards compat test

[AlCutter]

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[github-actions]

⚠️ Performance Alert ⚠️

Possible performance regression was detected for benchmark.
Benchmark result of this commit is worse than the previous benchmark result exceeding threshold 1.50.

Benchmark suite	Current: ca8eaed	Previous: 53d63f1	Ratio
BenchmarkDedup (github.com/transparency-dev/tessera)	5044013 ns/op 904911 B/op 18810 allocs/op	3155272 ns/op 902008 B/op 18787 allocs/op	1.60
BenchmarkDedup (github.com/transparency-dev/tessera) - ns/op	5044013 ns/op	3155272 ns/op	1.60
BenchmarkWitnessGroupSatisfaction (github.com/transparency-dev/tessera)	257701 ns/op 3697 B/op 46 allocs/op	139020 ns/op 3697 B/op 46 allocs/op	1.85
BenchmarkWitnessGroupSatisfaction (github.com/transparency-dev/tessera) - ns/op	257701 ns/op	139020 ns/op	1.85
BenchmarkProofBuilder/InclusionProof/WarmCache (github.com/transparency-dev/tessera/client)	135420 ns/op 15343 B/op 179 allocs/op	54853 ns/op 15337 B/op 180 allocs/op	2.47
BenchmarkProofBuilder/InclusionProof/WarmCache (github.com/transparency-dev/tessera/client) - ns/op	135420 ns/op	54853 ns/op	2.47
BenchmarkProofBuilder/InclusionProof/ColdCache (github.com/transparency-dev/tessera/client)	1234315 ns/op 689084 B/op 3555 allocs/op	414069 ns/op 689104 B/op 3555 allocs/op	2.98
BenchmarkProofBuilder/InclusionProof/ColdCache (github.com/transparency-dev/tessera/client) - ns/op	1234315 ns/op	414069 ns/op	2.98
BenchmarkProofBuilder/ConsistencyProof/WarmCache (github.com/transparency-dev/tessera/client)	73037 ns/op 15459 B/op 180 allocs/op	41516 ns/op 15441 B/op 180 allocs/op	1.76
BenchmarkProofBuilder/ConsistencyProof/WarmCache (github.com/transparency-dev/tessera/client) - ns/op	73037 ns/op	41516 ns/op	1.76
BenchmarkProofBuilder/ConsistencyProof/ColdCache (github.com/transparency-dev/tessera/client)	710321 ns/op 687891 B/op 3547 allocs/op	407440 ns/op 688133 B/op 3549 allocs/op	1.74
BenchmarkProofBuilder/ConsistencyProof/ColdCache (github.com/transparency-dev/tessera/client) - ns/op	710321 ns/op	407440 ns/op	1.74

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