feat: Add tab header "actions"

[gethinwebster]

Description

Add a slot for "actions", placed within the tabs header

Related links, issue #, if available: 4aAdA16jV0dV

How has this been tested?

New unit tests & permutations

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 96.42%. Comparing base (005def6) to head (1db7bd2).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/tabs/tab-header-bar.tsx	77.77%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #3293    +/-   ##
========================================
  Coverage   96.42%   96.42%            
========================================
  Files         791      791            
  Lines       22580    22583     +3     
  Branches     7794     7388   -406     
========================================
+ Hits        21772    21775     +3     
  Misses        801      801            
  Partials        7        7            

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[abdhalees]

Looks good overall.

but this metrics prop could become confusing

components/src/tabs/index.tsx

Line 52 in 50a91a6

hasActions: tabs.some(tab => !!tab.action),

I would initially think it refers to the header actions not a tab action, changing it would be a breaking change though, so adding a new metric prop hasHeaderActions could remove the confusion + it's useful anyway.

[gethinwebster]

Note: codecov failing due to unrelated lines [indent change only]. The related functionality is heavily integ-tested as it's challenging to test in unit testing environment.