Add 2 new categories to OIG reports

[patphongs]

Summary

• Resolves Add "investigations" and "other reports" categories to OIG reports page #4813

Adds 2 new categories to the OIG report options: "Investigations", "Other reports and plans".

Required reviewers

1 content, 1 front end

Impacted areas of the application

General components of the application that this PR will affect:

• OIG reports page

Screenshots

In website

In Wagtail

How to test

For content reviewers

• Inspect that the screenshot above looks good for the OIG dropdown on the website and in Wagtail.

For developers

• checkout this branch
• ./manage.py migrate - There's one migration file associated since there was a category change
• ./manage.py runserver
• Ensure that a report can be changed to a category "Investigations" or "Other reports and plans". Save and publish.
• Ensure that the report can be filtered by either "Investigations" or "Other reports and plans" on their reports page: http://localhost:8000/about/reports-about-fec/oig-reports/

[dorothyyeager]

Quick question - Drop down looks good for OIG page

For Wagtail, I notice on the document menu page you see all the options, including the ones that don't apply to OIG. If that's not something we can configure for OIG, would recommend just putting all the options in alphabetical order or if there's a way to group the ones they can do at the top, and then somehow disable the rest. Not sure if this is doable but happy to do a call to explain.

[dorothyyeager]

After checking with @patphongs, we'll open a separate ticket for the question I raised above.

[johnnyporkchops]

Works great! I was able to change report category in Wagtail and filter on reports web page. Worked for creating an OIG report as both a DocumentPage and ResourcePage.