[dagit] Repair tooltip flickering in log list
Use the fix suggested by https://github.com/palantir/blueprint/issues/4019 to resolve tooltip flickering when hovering on a PythonArtifactLink in the log list in a Run view.
Test Plan: Hover over the fake "link", verify that the tooltip renders and does not flicker.
Reviewers: rexledesma, bengotow, sashank
Reviewed By: rexledesma
Differential Revision: https://dagster.phacility.com/D5905