Before this change using --max-duration and --cutoff-mode soft would
work like --cutoff-mode hard.
This bug was introduced in this commit which made transfers be
cancelable - before that transfers couldn't be canceled.
122a47fba655704b accounting: Allow transfers to be canceled with context #3257
This change adds the timeout to the input context for reading files
rather than the transfer context so the files transfers themselves
aren't canceled if --cutoff-mode soft is in action.
This also adds a test for cutoff mode soft and max duration which was
missing.
See: https://forum.rclone.org/t/max-duration-and-retries-not-working-correctly/27738
4ac875a811