Fix Jira pages after rebases clobbered each other

This merge request attempts to fix the issues that arose when @aqualls, @alexkalderimis, and @sselhorn were all working on user/project/integrations/jira_integrations.md at the same time. If done right, it should:

• Restore Suzanne's tone and style edits.
• Move Alex's updates about the workaround process to doc/integration/jira/connect-app.md where they belong.
• Move the images that accompany Alex's changes to the correct directory.

Now let's see if the pipeline passes...

Related items

• Closes #326140 (closed)
• Suzanne's edits
• Alex's edits
• Related to #324250 (closed) which describes the overarching work