fix: Add more css specificity to center text in full width button dropdown main action

[abdhalees]

Description

In ButtonDropdown component with main action and full width props, the css style to align text to the center gets overriden sometimes by Button component default styles due to not having enough specificity.

in this commit, passing fullWidth prop to internal button ensures that the text-align style is applied with a specificity that doesn't get overriden by default styles.

Related links, issue #, if available: n/a

How has this been tested?

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

All modified and coverable lines are covered by tests ✅

Project coverage is 96.40%. Comparing base (938e31b) to head (b1bb23d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #3164    +/-   ##
========================================
  Coverage   96.40%   96.40%            
========================================
  Files         784      784            
  Lines       22136    22136            
  Branches     7602     7190   -412     
========================================
  Hits        21341    21341            
- Misses        743      788    +45     
+ Partials       52        7    -45     

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