Clean Feedzy crons during deletion

[kushh23]

Description

A user on the wp.org forum shared that the there are some feedzy cron events which are not being removed when deleting the feedzy plugin. I tested this and confirmed that, indeed, when the feedzy is removed, the cron event remains visible in the list, as shown here

Thank you!

Step-by-step reproduction instructions

1. Install and activate the WP Crontrol plugin.
2. Deactivate and delete the Feedzy plugin.
3. Go to Tools> Cron Events.