`TransactionPool` API uses `async_trait` #7146

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build-linux-stable	0s
build-linux-stable-cumulus	0s
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build-test-collators	0s
build-test-parachain	0s
build-linux-substrate	0s
prepare-bridges-zombienet-artifacts	0s
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build-push-image-polkadot-debug	0s
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