test: Get rid of default wallet hacks

Summary:

• Get rid of hardcoded wallet "" names and -wallet="" args
• Get rid of setup_nodes (-wallet, -nowallet, -disablewallet) argument rewriting

Motivation:

• Simplify test framework behavior so it's easier to write new tests without having arguments mangled by the framework
• Make tests more readable, replacing unexplained "" string literals with default_wallet_name references
• Make it trivial to update default wallet name and wallet data filename for sqlite #19077 testing
• Stop relying on -wallet arguments to create wallets, so it is easy to change -wallet option in the future to only load existing wallets not create new ones (to avoid accidental wallet creation, and encourage use of wallet encryption and descriptor features)

This is a backport of core#20034 [2/2]
https://github.com/bitcoin/bitcoin/pull/20034/commits/c1585bca8dae01dee6a1dd8eadae2f8b100503df

Depends on D10421

Test Plan: ninja check-functional-extended

Reviewers: #bitcoin_abc, majcosta

Reviewed By: #bitcoin_abc, majcosta

Subscribers: majcosta

Differential Revision: https://reviews.bitcoinabc.org/D10422