feat: tabs: alignIcon for default and pill and updates stat to add xsmall and optional button

[dkilgore-eightfold]

SUMMARY:

• Adds alignIcon prop and its TabIconAlign enum with Start and End options support to default and pill variants
• Adds buttonProps for an optional button per Stat for stat variant
• Adds XSmall to TabSize options to support extra small Stat Tabs size, this is mapped to Small for default and pill variants
• Adds Stories
• Adds unit tests

tabsUpdates.mp4

JIRA TASK (Eightfold Employees Only):

ENG-77358

CHANGE TYPE:

• Bugfix Pull Request
• Feature Pull Request

TEST COVERAGE:

• Tests for this change already exist
• I have added unittests for this change

TEST PLAN:

Pull the PR branch and run yarn and yarn storybook. Verify the Tabs and Stat Tabs stories behave as expected.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (adfb54d) 84.82% compared to head (5b6067d) 84.84%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #780      +/-   ##
==========================================
+ Coverage   84.82%   84.84%   +0.01%     
==========================================
  Files         999      999              
  Lines       19531    19542      +11     
  Branches     7284     7292       +8     
==========================================
+ Hits        16568    16580      +12     
+ Misses       2883     2882       -1     
  Partials       80       80              

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