fix(qa): Fix tests and minor cleanups after `addnode` was added

[oxarbitrage]

Motivation

After #9604 was merged, some cleanup was required. Additionally, a few minor bugs were discovered that needed to be fixed.

Solution

• Reverted a mistaken use of a unified address in the test config, restoring a valid Regtest transparent address (https://github.com/ZcashFoundation/zebra/commit/81893431120b98fcb5a6471428ba19735296ded9).
• Increased the Zebra startup timeout to reduce test flakiness (https://github.com/ZcashFoundation/zebra/commit/468426f130e3248f5305283834e4edbb33922dab).
• Cleaned up wallet tests by removing outdated TODOs after the addnode RPC was merged (https://github.com/ZcashFoundation/zebra/commit/e5043bac964657dc0626478a0e55c1ae470eddfa).

Tests

All tests in the framework pass locally.

PR Checklist

• [ ] The PR name is suitable for the release notes.
• [x] The solution is tested.
• [ ] The documentation is up to date.

[oxarbitrage]

@Mergifyio update

[mergify[bot]]

update

✅ Branch has been successfully updated

[conradoplg]

This seems to be stuck in CI in the same way that contributor PRs are getting stuck, which is weird. I'll just admin-merge it for now