Prevent support links in moz-fieldset from wrapping.
Style the legend element as an inline-block until there is a description
present. This case will switch the legend to block so that the
description is always on a new line.
Refactor and remove redundant code in moz-fieldset stories file.
Update main render function so that the support link is rendered
correctly if there is no description.
Add support link named slot.
Fixed styling of links by handling whitespace through whitespace
characters in the templates instead of CSS. This is because the way
templates need to be formatted to avoid these whitespace characters
will not pass our current linter rules.
Update tests for using support links in moz-fieldset.
Add stories for slotted support link and slotted support link with
description.
Differential Revision: https://phabricator.services.mozilla.com/D226550
65408c676d