[Cashtab] [chronik tx history p17] Remove legacy outgoingTx param

Summary:
T2447

Depends on D12145

Remove outgoingTx from the legacy object in parsed txs

New parsing uses the boolean incoming instead

Test Plan:
Review changes to unit tests and npm test
npm start, send and receive xec txs, confirm they are marked correctly

Reviewers: #bitcoin_abc, emack

Reviewed By: #bitcoin_abc, emack

Differential Revision: https://reviews.bitcoinabc.org/D12146