Reinstate extension manager

[jtpio]

References

Follow-up to #9236 and #8804

Code changes

Addresses the following TODO:

jupyterlab/buildutils/src/ensure-repo.ts

Lines 210 to 213 in e4ca0a3

	// TODO: reinstate once we update the extension-manager
	if (data.name === '@jupyterlab/extensionmanager') {
	return;
	}

User-facing changes

Backwards-incompatible changes

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[jtpio]

@jasongrout this would explain why @jupyterlab/extensionmanager was treated differently in the resolutions, as noticed yesterday.

[jasongrout]

Yes, good catch. Thanks!