Reduce number of Redmine API calls from backend

[kusalananda]

Related issue(s) and PR(s)

This PR relates to #646.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other

List of changes made

This PR changes the Urdr backend database. It adds three fields to the priority_entry table:

1. redmine_project_id
2. redmine_issue_subject
3. redmine_activity_name

These are added to reduce the number of API calls made by the backend to Redmine.

Screenshot of the fix

Testing

• A certain branch in other repos is needed
• A rebuild is needed due to new dependencies
• Requires new configuration settings
• Instructions on how to test

Further comments

Definition of Done checklist

• I have made an effort making the commit history understandable
• I have performed a self-review of my own code and commented any hard-to-understand areas
• Tests and lint/format validations are passing
• My changes generate no new warnings