Remove legacy browser support from js.module.css

Problem/Motivation

js.module.css includes some classes for older browsers as of 2023 #3404218: Table filter creates jank (layout shift) on page load.

https://caniuse.com/?search=scripting shows pretty broad support across multiple releases now.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet