Change grant update logic

[rpoet-jh]

This PR has changes to simplify and make the grant update logic more consistent. The following changes were made:

• Change source grant query to pull all records for any grants updated since last updated filter.
• Change grant update logic to update all grant fields if source grant system result set contains records for a grant. This can be done because it is now assumed that if a grant is changing, then all records for the grant are supplied in result set.
• Change aggregation logic so that setting of start/end/pi based on grant record aggregation is more consistent.
• Make piEmail field optional, user.email is now optional.
• Add more tests for update scenarios.

The rules for aggregation of grant records are as follows:

• For all grant records for a grant, use the grant record with awardDate to compute the earliest record base on awardDate to set the start attributes.
• For all grant records for a grant, use the grant record with awardDate to compute the latest record base on awardDate to set the end attributes and PI.
• If all grant records for a grant have no awardDate, then the startDate and endDate will be used to compute the earliest and latest records respectively.
• If all grant records for a grant contains records with and without awardDate, the records with awardDate will take precedence in determining the earliest and latest records.

[markpatton]

This is a really good update and cleanup. The update logic is a lot easier to understand now.

Tests pass for me locally.