Allow users to include or exclude cross-referenced entries when copying via the "Copy To" menu

[HoussemNasri]

Depends on #12339

Why?

https://discourse.jabref.org/t/seamless-crossreferencing/100

How?

When the user copies an entry via the "Copy to" menu, show a dialog with the following options:

• Copy entry only.
• Copy associated/cross-referenced entries.
• Cancel

Copy entry only

• Will copy that entry ignoring any entries it references.

Copy associated/cross-referenced entries

• Runs a single copy operation of the target entry and the entries it references

Cancel

• Close dialog

Regarding cite key clashes: If an entry with the same cite key is already found in the destination library:

• a) the user has auto generation of citation keys activated -> This would work after copying. I think similar to importing.
• b) no auto generation: we skip it and show a warning at the end (e.g. in a "Result dialog" like done for copying of BibTeX strings)

Definition of Done

Unit tests for the new dialog (via its view model)

[priyanshu16095]

I am working on issue #12340, but issues #12339 and #12338 are its parent issues.
Could you please assign this issue to me?

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[priyanshu16095]

/assign-me

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[leaf-soba]

I am working on issue #12340, but issues #12339 and #12338 are its parent issues. Could you please assign this issue to me?

I think you mean the issue 12338, not the PR 12338?

[github-actions]

👋 Hey @leaf-soba, it looks like you're interested in working on this issue! 🎉

If you'd like to take on this issue, please use the command /assign-me to assign yourself.

[priyanshu16095]

@leaf-soba Sorry, not issue #12338; it's #12341 instead.