Prettify schedule description in update PRs

[RahulGautamSingh]

Describe the proposed change(s).

After, moving to cron for default scheduling and presets, the schedule description in the update PRs look bit ugly and not readable

Example:

We can fix this by using the cronstrue library or maybe a better library(cronstrue does not support some special chars) which provides human-readable summmary of cron schedules.