blocks #5376

this is the closest thing there is to an upgrade guide: https://github.com/UniversalViewer/universalviewer/wiki/UV-Examples

As part of this upgrade we can import and use uv directly instead of polling for its load like we did here https://github.com/pulibrary/figgy/pull/5774/files#diff-b098a3077a1b985669f90a65c37d07c6721005767eaf48a32c11b2443c0ac99aR4