`fatxpool`: rotator cache size now depends on pool's limits #364

Job	Run time
preflight / preflight	45s
preflight / ci-versions	59s
build (polkadot-availability-recovery, availability-recovery-regression-bench)	8m 15s
build (polkadot-availability-distribution, availability-distribution-regression-bench)	6m 9s
build (polkadot-node-core-approval-voting, approval-voting-regression-bench)	23m 29s
build (polkadot-statement-distribution, statement-distribution-regression-bench)	5m 1s
publish-benchmarks	0s
	44m 38s

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