fix: merge conflict dialog added when overwriting files on move-file action

[emoral435]

• Resolves[Bug]: When moving a folder, no merge dialog appears if the folder names are the same. #43489

Summary

• When user decides to move file to new destination, if a file with that same name already exists, currently, our implementation overrides the old file and injects the new file

Resolution

• In order to resolve this, use @nextcloud/upload to check if there is a conflict, and if there is, shows a conflict dialog to resolve how the user wishes to proceed with the conflicting dialogs
• If the conflict dialog returns two empty arrays, selected and renamed, that means the user chose to keep the file already in the directory path, thereby choosing to delete the current selected file they want to move

Screenshots / GIF

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[Pytal]

Not related to this change but the conflict dialog close button is focusable with the keyboard but unclickable

I believe this is an issue with the z-index

[emoral435]

Hm. Good observation, and I can replicate it. I will investigate this issue!

[skjnldsv]

Logic makes sense!

[github-actions]

Possible performance regression detected

Show Output

564 queries added
= /remote.php/dav/files/test
= /remote.php/dav/files/test/test.txt
= /remote.php/dav/files/test/many_files
= /remote.php/dav/files/test/new_file.txt
= /remote.php/dav/files/test/new_file.txt
= /remote.php/dav/files/test
= /remote.php/dav/files/test/test.txt
= /remote.php/dav/files/test/many_files
= /remote.php/dav/files/test/new_file.txt
= /remote.php/dav/files/test/new_file.txt
+ /remote.php/dav/files/test added with 45 queries
+ /remote.php/dav/files/test/test.txt added with 33 queries
+ /remote.php/dav/files/test/many_files added with 46 queries
+ /remote.php/dav/files/test/new_file.txt added with 67 queries
+ /remote.php/dav/files/test/new_file.txt added with 91 queries
+ /remote.php/dav/files/test added with 45 queries
+ /remote.php/dav/files/test/test.txt added with 33 queries
+ /remote.php/dav/files/test/many_files added with 46 queries
+ /remote.php/dav/files/test/new_file.txt added with 67 queries
+ /remote.php/dav/files/test/new_file.txt added with 91 queries

[solracsf]

/backport to stable28