[CI] Update build-configurations with secp256k1 dependencies

Summary:
Now that we build ecash-lib-wasm from our own secp256k1, this adds that library to a whole lot of build targets as dependency.

Also, there were some spurious dependencies regarding cashtab:

• ecash-lib-tests had cashtab/ as dependency, but the relationship is reversed
• cashtab-tests had a whole bunch of missing dependencies

Those are fixed in this diff also.

Test Plan: CI

Reviewers: #bitcoin_abc, Fabien, PiRK, bytesofman

Reviewed By: #bitcoin_abc, Fabien, PiRK, bytesofman

Differential Revision: https://reviews.bitcoinabc.org/D16981