Theming ?inline css imports not consumable in Enterprise

[bmingles]

Description

The ?inline css imports used in @deephaven/components for theming don't seem to be compatible with Enterprise

Steps to reproduce

Run Enterprise with dh v0.51.0

Expected results

CSS variable content should be inlined

Actual results

Theme css variable content is empty.

Versions

• Web UI Version: 0.51.0