feat: dynamically register MN in functional tests without IS

[knst]

This PR has important fixes to implement "single-node quorum" feature.

Issue being fixed or feature implemented

Without IS-quorum you can not dynamically add a new MN or Evo node.
For evo nodes adding it dynamically is the only way.

What was done?

Fixed a function that dynamically adds a masternode without Instant Send quorums; use it in a functional test feature_asset_locks.py

As side effect it improves performance of functional tests which do not wait more IS lock significantly; for feature_asset_locks.py it gave ~20 seconds per run.

How Has This Been Tested?

See updates in feature_asset_locks.py, feature_llmq_evo.py, feature_dip3_v19.py

Breaking Changes

N/A

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have made corresponding changes to the documentation
• I have assigned this pull request to a milestone (for repository code-owners and collaborators only)

[UdjinM6]

utACK 37fbdee

[PastaPastaPasta]

utACK 37fbdee

Although I would say I'd prefer this to be scope "test" or something similar, as it's hard to call these changes a feat