Add support to filter out short video clips in scan

[ikmckenz]

Resolves #3160. Tested working locally, there is an associated UI change that looks like so:

The implementation is slightly complicated by #5949 , all three scan paths for a file (onExistingFile, onUnchangedFile, onNewFile) need to support the filtering.

[DogmaDragon]

Does this affect Scan Video Extensions as Image Clip functionality as I know some people are using it for their short videos?

[ikmckenz]

Looks like as written, yes, these are filtered out since they are still processed as videos internally and so have a duration. Guessing I'll have to figure out how to not do the filtering on image-only libraries when Scan Video Extensions as Image Clip is enabled?

[DogmaDragon]

I would probably wait for @WithoutPants feedback in general, I just wanted to bring attention to the use case since it can get easily overlooked, but is very important to some people.

[WithoutPants]

This approach isn't something I'd be considering. The scan process should be ingesting video files regardless of duration. The intended solution is to provide better control over the creation of scenes from video files. This is still WIP pending features to manipulate assigned files to scenes and images.

[ikmckenz]

What are those pending features out of curiosity, any help needed?