Improve diff for implements becoming extends

[tsantalis]

https://github.com/JabRef/jabref/pull/11282 src/main/java/org/jabref/logic/importer/ImportCleanupBiblatex.java

[pouryafard75]

@tsantalis Is the information available in the API at the moment? If yes, please assign this to me.

• [x] Fix the core
• [x] Fix the diff

[tsantalis]

@pouryafard75 No it is not reported by RMiner yet

[tsantalis]

@pouryafard75 UMLClassBaseDiff APIs

public Optional<Pair<UMLType, UMLType>> getImplementedInterfaceBecomesSuperclass() {
    return implementedInterfaceBecomesSuperclass;
}

public Optional<Pair<UMLType, UMLType>> getSuperclassBecomesImplementedInterface() {
    return superclassBecomesImplementedInterface;
}

[pouryafard75]

Original Example:

Original Example with commit order reversed: