deleter: prioritise different file types

[incognitojam]

Deleter processes files one at a time, ranking them based on:

• whether the segment is preserved
• whether the file is for "dashcam" (qlog, qcamera.ts)
• whether the file is for "training" (rlog, hevc...)

The amount of files classified as "training" is limited to 5GB. This means that only the most recent 5GB of training files are retained and the excess is de-prioritised and deleted to make space for other files.

• deprioritise old training data over size limit
• delete empty folders
• deleting all of file type in the same segment? deleting one training file and keeping another would be useless...

[maxime-desroches]

You can rebase on master to solve the Jenkins failures

[github-actions]

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