UI bug: stuck pending card on tx history panel when transaction is replaced

[fionnachan]

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1. Allow users to clear each pending tx row by clicking "X" on the respective row #985
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2. Compare nonce of pending txs vs wallet address latest nonce to automatically clear stale pending txs #986
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[fionnachan]

check nonce and if the pending txs have a lower nonce than the latest tx, clear them

[fionnachan]

we currently don't store nonce / transaction count in the Transaction object in local storage
if we want to compare the nonce we'll have to add it to the Transaction object from useArbTokenBridge