Make attending authors and primary attendees configurable

[gjvoosten]

Whether attending authors or primary attendees are required can now be configured through the dictionary.

Closes AB#988

User changes

• Depending on dictionary settings, attending authors or primary attendees may now no longer be required.

Superuser changes

• None

Admin changes

• None

System admin changes

• anet.yml or anet-dictionary.yml needs change
  Add something like the following under fields.reports in the dictionary:

    reportPeople:
      optionalAttendingAuthor: false
      optionalPrimaryAdvisor: false
      optionalPrimaryPrincipal: true
      attendeeGroups:
        - label: Linguists
          filter:
            orgUuid: 70193ee9-05b4-4aac-80b5-75609825db9f
  

  (note that the pre-existing attendeeGroups setting has moved to be under the new reportPeople settings)
• db needs migration
• documentation has changed
• graphql schema has changed

Checklist

• Described the user behavior in PR body
• Referenced/updated all related issues
• commits follow a repo#issue: Title title format and these 7 rules
• commits have a clean history, otherwise PR may be squash-merged
• Added and/or updated unit tests
• Added and/or updated e2e tests
• Added and/or updated data migrations
• Updated documentation
• Resolved all build errors and warnings
• Opened debt issues for anything not resolved here