Enable email of filtered or unfiltered logs

## Changes in this PR
* Send email address and filtered logs to emailing function via JSON
* Validate email address with `validate_email` library
* Send error message to user via UI if email address invalid
* Send success message to user via UI if email sends successfully
* Format logs so that each log appears on a new line in email

@robertkluin-wf @beaulyddon-wf @amandeepgill-wf