Implement UTXO TSC-like condition to avoid picking up close-to-eviction conflict

[karimodm]

• Enforce strict rule on weak and liked instead references to not be able to rescue a conflict beyond TSC.
• If this is not enforced, a conflict that is been pruned from the ConflictDAG can be arbitrarily re-introduced with a weak reference, effectively causing the inclusion time of a transaction to be arbitrarily in the past, violating epoch commitments and TSC,