Runtime error on JL < 4.4

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Figured this out. RestContentProvider was only added in JupyterLab 4.4: jupyterlab/jupyterlab#17092

For now, we all need to have JupyterLab 4.4+ installed to test the main branch. We should probably explore loosening our version constraint on jupyterlab in the future.

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Discussed this with @ellisonbg this morning. JL 4.4 & JCollab 4 introduced a bunch of fixes for the RTC: drive prefix issue. It will be more difficult to support JCollab 3 & JL <4.4 since these fixes will not be available, so this issue is not a priority now.

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JSD can now be installed on top of JCollab 4, which requires JL >=4.4. Since many users will be installing this on top of JCollab 4, we are not seeking to support older minor versions of JupyterLab at this time.

We may revisit this in the future if we receive user requests for this.