Current changes on main, including bugfixes, to assist with testing with
s2, until the base branch is updated with main.

The options and naming around densities has changed in s2. There is now:
- Medium / default (was previously "compact")
- Large (was previously default)
- Multiline (existing)

This updates the controls, classes, and tokens around that.

It also sets the bulk of the new values for existing custom properties
that have changed in s2.

Leverage changing custom property values for --large and --multiline,
instead of creating new properties for every variant. This reduces the
number of custom properties and slims down the CSS.

Pulls in most of the stories from main, and changes compact stories to
large stories--

This commit can be modified or dropped once spectrum-two is up to date
with all of the stories and template changes on main. This excludes
BreadcrumbGroup, test.js, etc.

Finalize use of s2 tokens defined in design, including new tokens and
changes. Adjusts which multiline tokens are applied.

The new specs specified that title item can be customized in the
multiline variant, with preferred sizing. This adds support for that
in our template and adds a new Storybook control.

Adjusts some spacings and the tokens used to make sure that this is
adhering to the tokens defined on the design spec.

Of note, this helps fix:
- Too much horizontal spacing beside truncated menu; there needed to be
  different spacing for text to separator and truncated menu to
  separator. To allow this be changed, some margins/paddings were
  moved around to different elements than before.
- Uses correct start edge spacing (previously padding on the ul), which
  needs to be different for text items and the truncated menu item.

- update component height token used
- remove two unused custom properties