Add term filter to summary of authors_not_graduated data

[jazairi]

Why these changes are being introduced:

Report#data_authors_not_graduated does not include a grad_date filter,
so all theses with ungraduated authors are shown for each term
instead of just the theses for the corresponding term.

Relevant ticket(s):

https://mitlibraries.atlassian.net/browse/ETD-429

How this addresses that need:

This adds the term filter into Report#data_authors_not_graduated

Side effects of this change:

N/A.

Developer

• All new ENV is documented in README
• All new ENV has been added to Heroku Pipeline, Staging and Prod
• ANDI or Wave has been run in accordance to
  our guide and
  all issues introduced by these changes have been resolved or opened as new
  issues (link to those issues in the Pull Request details above)
• Stakeholder approval has been confirmed (or is not needed)

Code Reviewer

• The commit message is clear and follows our guidelines
  (not just this pull request message)
• There are appropriate tests covering any new functionality
• The documentation has been updated or is unnecessary
• The changes have been verified
• New dependencies are appropriate or there were no changes

Requires database migrations?

NO

Includes new or updated dependencies?

NO

[coveralls]

Coverage decreased (-0.002%) to 97.17% when pulling f5b59a0 on etd-429-author-not-graduated into f6f6a28 on main.

[jazairi]

I'm not sure how coverage drops when adding a test, but I wonder if it's because the number of lines changed in Report#data_authors_not_graduated.