[Cashtab] Airdrop OP_RETURN patch
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Description

[Cashtab] Airdrop OP_RETURN patch

Summary:

As per T2512, this diff embeds the airdrop token id into the message portion of the OP_RETURN output, rather than being its own hex'ed portion of the OP_RETURN script array.
sendXec() OP_RETURN script logic now appends the token id to the message string
parsedTxHistory() extracts the token id from the message substring and the remainder becomes the message content itself
Adjusted mockTxDataWithPassthrough and mockParsedTx to reflect this updated OP_RETURN parsing logic

Test Plan:

npm start
send airdrop with a message and observe only the message is displayed and verify full output hex in explorer is correct
ensure message is displayed correctly from an airdrop recipient wallet
send airdrop with no message and ensure no message is displayed and verify full output hex in explorer is correct
regression test the Msg button to copy the message content to clipboard
regression test an OP_RETURN message from electrumABC and ensure it's rendered as an external message
regression test a non-airdrop one to one XEC tx
regression test a non-airdrop one to many XEC tx
regression test an encrypted XEC message and verify correct output hex
regression test an eToken tx

Reviewers: bytesofman, #bitcoin_abc

Reviewed By: bytesofman, #bitcoin_abc