fix copying RGP captures by checking for completion

Samuel Pitoiset requested to merge fix_rgp_capture_copy into main

Waiting 0.1s before starting the copy over SSH isn't enough because the trace might not be completely written on disk and this can copy corrupted captures.

To fix this, wait for completion by checking the RGP capture size over SSH. This is simple and should be robust enough. An alternative solution would be inotify but inotifywait isn't installed on Deck.

Closes: #3 (closed)

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