Label: updates to support new design

[mcoker]

Placeholder for patternfly/patternfly#2656. Will likely result in changes to the current label component elements.

[mcoker]

The core work is complete. A full list of changes is in the description of the PR. patternfly/patternfly#2943

[evwilkin]

May be partially addressed in #4116 (removed isCompact prop)