Use consistent spacing in Jira Issue Detail sidebar

!61650 (merged) resolved various spacing inconsistencies on the GitLab issues sidebar. It appears there are similar inconsistencies in the Jira Issue Detail sidebar.

Refer to !61650 (merged) for how best to fix the spacing: it mostly involves replacing uses of the title class with gl-line-height-20 gl-mb-2 gl-text-gray-900