fix: have connection previewer use the registry #7800
Merged
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The basics
The details
Resolves
Work on #7204
Proposed Changes + reasons
Makes it so the block dragger accesses the previewer class from the registry, so that it is possible for folks to provide their own connection previewers. The InsertionMarkerPreviewer registers itself as the default connection previewer.
Test Coverage
All tests pass. Insertion markers continue to be created.
Documentation
Filed a tracking task against myself for documenting connection previewers.
Additional Information
Dependent on #7797