Fix: reactstrap tooltips causing browser tab to freeze
Created by: attfarhan
Fixes #4853.
The commit https://github.com/sourcegraph/sourcegraph/commit/d9e6207cb7790db2a5fa13e90af4423c5cb47299 resulted in a bug that would cause the entire page to freeze if the tooltip popovers that appear when hovering on some buttons had too much content, which is a bug in the upgraded version of reactstrap. This PR implements a workaround mentioned in the issue, which disables the flip
modifier of the tooltip.