Fix file renaming

[koppor]

1. Start JabRef
2. Check preferences that the citation key pattern for files is [bibtexkey] - [title]
   
3. Create new library
4. Save library to folder main/src/test/resources/pdfs/PdfContentImporter
5. Drag an drop file Bogner2023.pdf from main/src/test/resources/pdfs/PdfContentImporter
6. Go to tab "General"
7. Scroll down to "File"
8. Right click and select"Edit"
   
9. See that filename misses citatoin key
   
10. Select "Quality" > "Cleanup entries"
11. Ensure that "Rename PDFs to given filename format pattern" is checked.
12. Click OK
    
13. In the warning, click "Autogenerate PDF Names"
    
14. Click on "Edit" again. See that citation key is in:
    

Wish: File should have correct name after import.

Task:

1. Understand what happens at drag and drop
2. Ensure that citaton key generation happens before file name renaming

If 2 is not possible, report back, why.

---

Risen by #12540

[beginner003]

/assign-me

[github-actions]

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[edgarwolff]

The bug essitially comes from the fact that when the interaction process from the EventHandler gets through the lambda in MaintTable to the ImportHandler.java file the call at line ImportHandler::162 to DragDrop::handleDropOfFiles that induces the file copy the BibEntry's String key is not defined yet.
This key is defined when later at line ImportHandler::201 the call to ImportHandler::importEntries in a separate async threadis indeed executed.
To tackle this problem, a fix is to call the method in charge of this generation before the file importation by inserting a call such as generateKeys(Collections.singletonList(entry)); right before the current line 162 of the file ImportHandler.java
This has no noticeable side effect on other functionnalities behavior and fixes the bug.