Remove vendor TxPool & Debug code if possible

[Dinonard]

After polkadot-evm/frontier#1073 and polkadot-evm/frontier#1237 were merged into upstream frontier, we should check if it is possible to remove vendor code from Astar repo related to Tx Pool and Debug functionality, and just use regular frontier code instead.

[github-actions]

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[ashutoshvarma]

This is completed in stable2412 release