fix: getFilterName() treats geneExp and metabolite same as float terms

[xzhou82]

Description

now a standalone function, with unit tests http://localhost:3000/testrun.html?dir=mds3&name=filterName.unit

test with dictionary term filtering works on non-gdc and gdc tracks

however, unable to test gene exp filter for non-gdc track, due to unknown error possibly at data loading (seems no variants are loaded), and unrelated to this change

Checklist

Check each task that has been performed or verified to be not applicable.

• [x] Tests: added and/or passed unit and integration tests, or N/A
• [x] Todos: commented or documented, or N/A
• [x] Notable Changes: updated release.txt, prefixed a commit message with "fix:" or "feat:", added to an internal tracking document, or N/A

[karishma-gangwani]

I am seeing a failing test.

not ok 1 loading of all import(spec) timed out after 5000ms

[xzhou82]

you need to kill and restart npm run dev. there's some issue with that when switching branches