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[acha-bill]

Description

Ability to confirm conflicting bundle while applying only the first to the ledger. The order of bundles is determined by a topological sort via DFS preferring trunk first.

Fixes #1684

Type of change

• Enhancement (a non-breaking change which adds functionality)

How Has This Been Tested?

• Existing unit and regression tests pass
• Added new regression test where a milestone approves 2 double-spend bundles and asserts that even though only 1 affects the ledger, they are both confirmed.

Checklist:

• [x] My code follows the style guidelines for this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes