[ecash-lib, CI] Modify output type to include the OP_RETURN template

Summary:
Modify CI so that cashtab-faucet tests run when ecash-lib changes. ecash-lib CI is broken because the latest version of ecash-lib throws a ts-error on the blank OP_RETURN type { sats: 0n }

Update type so this is tolerated, update CI to prevent recurrence.

Test Plan:
npm test

cd apps/cashtab-faucet
npm run build
npm test

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D18403