[backport#15404] Address test todos by removing -txindex to nodes.

Summary:
Originally added when updating getrawtransaction to stop searching unspent utxos.

https://github.com/bitcoin/bitcoin/pull/15404/commits/8e4b4f683a0b342cec24cd51b1e98433034ea2ea

Depends on D6069

This is a backport of Core PR15404

Test Plan:

ninja check-all

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D6070