fix: Error when renaming a file or directory with the "/" character

[ArielLeyva]

Description

I added a container below the file name input field that draws the actual path where the file will be created. This is a possible solution to issue #5306 "Unexpected behavior when changing folder and filenames in filebrowser."

Additional Information

I wouldn't like to give up creating a file within one or more directories directly in the new file creation modal, so I added this behavior (similar to how github handles it when adding a file)

Checklist

Closes #5306

• I am aware the project is currently in maintenance-only mode. See README
• I am aware that translations MUST be made through Transifex and that this PR is NOT a translation update
• I am making a PR against the master branch.
• I am sure File Browser can be successfully built. See builds and development.

[ArielLeyva]

This is how the path where the file will be created appears

[ArielLeyva]

This is the error message when typing the "/" character when renaming a file or directory (preventing a new file or directory from being created in another location)