[dagit] Repair tooltip flickering in log list

Summary:
Resolves #3523

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