do not call niceNumLabels() on integer term density/violin

[creilly8]

Description

Addresses issue #1716.

Changes:

1. Do not pass decimals from the violin when the term type is integer.
2. New unit test and file specifically for tvs.density
3. Filter pill only shows rounded numbers

Test with:

1. Edit violin in the control panel and filter. Also brush the plot -> Add filter -> Filter in navigation -> only rounded numbers.
2. Other violin render plots: Age at dx from sample label
3. Unit tests

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

[xzhou82]

related issue. from integer violin, select range and "Add to filter", then the tvs pill will contain decimal.

[creilly8]

related issue. from integer violin, select range and "Add to filter", then the tvs pill will contain decimal.

Fixed in https://github.com/stjude/proteinpaint/pull/1723/commits/89ae6b457d9432fd0e998a6ff43bbdb806c4fe74

[airenzp]

Thanks for the fixes and the tests. Seems on the right track. Now the integer handling is restored.