Fix #4311 add comment field to product drive participant

[jimmyli97]

Resolves #4311

Description

• Can add comments when creating new participant under Community
• Can add comments when creating new participant under Donation
• Can edit comments when editing participant under Community
• Can view comments on single participant page after clicking "View" action on Product Drive Participants index
• Validates comment to be less than 501 characters
• RSpec tests written for all above changes
• Refactor old documentation and CSS ID

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

1. bundle exec rspec
2. adding comment in browser using all above methods