Fixed image discussion styling
What does this MR do?
Fixes the styling of image discussions in Firefox, the height was causing it to overlay.
Also fixes some styling bugs caused by the discussion styling changes.
What are the relevant issue numbers?
Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/54110
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
Tests added for this feature/bug -
Conforms to the code review guidelines -
Conforms to the merge request performance guidelines -
Conforms to the style guides -
Conforms to the database guides -
Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.