[BUG] Too many files in collection dropbox blocks creating new items

[cjcolvar]

Describe the bug
Avalon passes all of the filenames of files in the dropbox into a single lsof command which fails with Errno::E2BIG if there are too many files in the dropbox.
Report in slack by Sahab Bolhari.

Expected behavior
Avalon can create new items in a collection no matter how many files are in the dropbox.

Screenshots/Screen Recording
Truncated error message:

avalon_1 | F, [2023-09-27T20:02:04.115601 #1] FATAL -- : [458a3c42-248e-4b9c-9d00-f86b187772fc]
avalon_1 | [458a3c42-248e-4b9c-9d00-f86b187772fc] Errno::E2BIG (Argument list too long - /usr/sbin/lsof -Fcpan0 "2021-053-05.flac" "2021-070-01.flac" "1998-169-17.flac" "1989-021-01.flac" "2023-039 (4).flac" "2016-014-04.flac" "2019-100-11.flac" "2021-041-21.flac" "1998-067-01.flac" "2019-037-01.flac" "2017-017-01.flac" "2016-076-07.flac" "2018-088-01.flac" "2022-053a-08.flac" "2022-080-11.flac" "2016-105-03.flac" "2022-107.flac" "2022-030-08.flac" "1994-020-04.flac" "2023-115 (4).flac" "2018-035.flac" "2018-011-02.flac" "1986-010-02.flac" "2017-080-03.flac" "1989-112-03.flac" "1992-041-01.flac" "2015-090-05.flac" "1985-100-25.flac" "1993_103.flac" "1996-010-01.flac" "1997-158-07.flac" "2023-078.flac" "2018-095-11.flac" "2019-005-03.flac" "1985-100-04.flac" "2015-019-02.flac" "2022-110-02.flac" "1997-133.flac"

Environment (please complete the following information):
Docker

Release:
Is this issue associated with a specific release? Unknown

Additional notes
See https://github.com/avalonmediasystem/avalon/blob/main/lib/avalon/batch.rb#L36-L42

[joncameron]

Could implement a paging of the files or some other way to rework this (a splat, xargs style thing) to avoid an obscenely long line for getting the files list.