Fix hover reposition jank 2

Created by: chrismwendt

• https://github.com/sourcegraph/sourcegraph/pull/34028 Original PR
• https://github.com/sourcegraph/sourcegraph/pull/34206 Revert
• This PR reapplies the original PR with a fix that avoids the bug in the original

Only the "fix" commit needs to be reviewed (and subsequent commits if there are any).

Fixes https://github.com/sourcegraph/sourcegraph/issues/33987

Test plan

Manual + automated tests

App preview:

• Web
• Storybook

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