Switch to using curl instead, which doesn't have this problem (and
outputs to stdout by default, too)

Users don't expect not-recorded meetings to appear when rebuilding
all of their existing recordings.

You can still use bbb-record --rebuild on a single not-recorded
meeting to force it to process.

Fixes #6394

The bbb-webrtc-sfu logs are getting rotated, but the old logs just accumulate. Add the directory to the bigbluebutton cron.daily so they get removed.

 Do not delete errors.log as it will contain information when KMS crashes.