fix(Tabs): reset active index to selected index for manual activation

[emyarod]

Closes #17591

This PR adds blur handlers to the tabs and vertical tabs components to reset the active tab index to the selected tab index.

Changelog

New

• handleBlur methods

Testing / Reviewing

• view the Manual tabs story
• click/select a tab
• navigate to another tab using the arrow keys
• select the other tab by pressing Enter
• focus on a different element that isn't another tab
• move focus back to the tab list and confirm that focus returns to the selected tab rather than the last active tab

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[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 2 lines in your changes missing coverage. Please review.

Project coverage is 80.14%. Comparing base (7115f33) to head (c28c40e).
Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/react/src/components/Tabs/Tabs.tsx	85.71%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17831      +/-   ##
==========================================
- Coverage   80.14%   80.14%   -0.01%     
==========================================
  Files         406      406              
  Lines       14029    14039      +10     
  Branches     4391     4395       +4     
==========================================
+ Hits        11243    11251       +8     
- Misses       2620     2621       +1     
- Partials      166      167       +1     

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[alisonjoseph]

LGTM!