Tests

Introduce a builder to create PagedPool instances #6536

Job	Run time
Cargo benchmarks	14m 39s
Clippy	3m 49s
Clippy & Tests (macOS)	8m 57s
Check all targets	3m 37s
Tests (FUSE 3)	6m 13s
Doc-Tests	4m 16s
Formatting	31s
Tests (FUSE 2)	6m 10s
Container build checks	7m 40s
CRT docs	2m 0s
Licenses	45s
Shuttle tests	8m 10s
Cgroup memory limit detection	6m 26s
Packaging script checks	8s
Benchmark script checks	8s
Tests Workflow Complete	2s
	1h 13m 31s

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