Fix bug with MCAS score range for E, move into helpers #2226
Who is this PR for?
What problem does this PR fix?
The school overview page filters have a bug that prevents "E" scores from being filterable for next gen MCAS. This came up testing new MCAS data for Bedford.
What does this PR do?
Fixes the bug; factors out these definitions into
Screenshot (if adding a client-side feature)
Which features or pages does this PR touch?
Does this PR use tests to help verify we can deploy these changes quickly and confidently?