identity: add eos-after property
Using `num-buffers` can be unpredictable as buffer sizes are often arbitrary (filesrc, multifilesrc, etc.). The `error-after` property on `identity` is better but obviously reports an error afterwards. This adds `eos-after` which does exactly the same thing but reports EOS instead.
identity-eos-after in 74 minutes and 41 seconds (queued for 6 minutes and 38 seconds)6 jobs for