remove_file_extensions is more robust to various fov naming schemes

[srivarra]

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What is the purpose of this PR?

Closes #537.

Allows more complex fov name parsing in remove_file_extensions.
Removes the extensions correctly for files named such as:

"fov.1" -> "fov.1"
"fov.2.tiff" -> "fov.2"
"fov3" -> "fov3"
"fov4.tar.gz" -> "fov4.tar"

How did you implement your changes

Added explicit checks for the following file extensions:

"tiff", "tif", "png", "jpg", "jpeg", "tar", "gz", "csv", "feather".

Added an extra test for more complicated fov filenames.

Remaining issues

Should we account for more file extensions?

[ngreenwald]

Not sure why coverage is dropping, can you see if this is real or an artifact?