Validation of forecast files submit date less than (issue date + 1d)

[mzorn-58]

Add automation check for forecasts uploaded > 24 hours after appropriate Monday deadline.

See https://reichlab.slack.com/archives/C011SKXLBA8/p1610122399412600

Description

• Add a validation check to ensure that the date at which the forecast is submitted has a date within 24 hours of the date on the forecast file.
• The date to check would be the date at which the validation was run.
• Send a comment/warning about the date of the forecast.
• The date to be checked would be in EST.

[Yuxin (David) Huang]

@hannanabdul55 is monitoring the migration process. Will close when old validation is removed.

[Abdul Hannan]

This is done. Closing it.