FE: Parse CRON scheduling syntax

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Why are we doing this work

• It is easier to read parsed CRON syntax than CRON syntax

Relevant links

Non-functional requirements

• Documentation:
• Performance: Will the new library be too large?
• Testing:

Implementation plan

~~- [ ] frontend humanize CRON syntax~~ ~~- the docs say we have the cron-validate library on the frontend , which parses cron, but instead we have cron-validator, which only validates CRON syntax.~~ ~~- We should swap out the libraries and get cron-validate, but also fix any instances of cron-validator in the codebase~~

• frontend it turns out neither cron-validate nor cron-validator makes cron human readable, so find a library that does and import it to make the cron human readable