feat(ListItem,Button,ToolbarItem,ToolbarMenu): Adding/fixing universal focus indicator

[bcalvery]

Updating ListItem, Button, ToolbarItem, ToolbarMenuItem to use the common "getBorderFocusStyles" component to indicate keyboard focus.

Also incorporated theme changes for button - fixing issues reported by design.

Note: Keyboard focus is now a distinctly separate treatment from hover.

ListItem:

Selected item at bottom of each list, keyboard focused item at top.
Before:

After:

Button:

Issue with border was in the wrong position (it should be outboard of main button border)
Idle state on left, keyboard focus state on right.
Before:

After:

Before:

After:

Note style of circular button is changed to behave like normal button.
Also updated buttonVariables to use colorScheme variables.

ToolbarItem

Before:

After:

ToolbarMenuItem:

Before:

After:

[codecov]

Codecov Report

Merging #2011 into master will increase coverage by 5.48%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2011      +/-   ##
==========================================
+ Coverage   68.52%   74.01%   +5.48%     
==========================================
  Files         910      167     -743     
  Lines        8306     5895    -2411     
  Branches     2438     1738     -700     
==========================================
- Hits         5692     4363    -1329     
+ Misses       2600     1518    -1082     
  Partials       14       14

Impacted Files	Coverage Δ
...s/components/RadioGroup/radioGroupItemVariables.ts
...mponents/Icon/svg/ProcessedIcons/icons-zoom-in.tsx
.../components/Icon/svg/ProcessedIcons/icons-hand.tsx
...src/themes/teams/components/Dialog/dialogStyles.ts
...s/Icon/svg/ProcessedIcons/icons-files-document.tsx
.../themes/teams/components/Icon/svg/icons/italic.tsx
...emes/teams/components/Toolbar/toolbarMenuStyles.ts
...c/themes/teams/components/Icon/svg/icons/robot.tsx
...-contrast/components/TextArea/textAreaVariables.ts
...s/accessibility/src/behaviors/Tree/treeBehavior.ts
... and 722 more

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[codepretty]

I keyboarded around a few components and looks good from what I can tell! thanks Brian!!