feat: enable header to accept custom menus

[syedsajjadkazmii]

This PR adds the following functionality

• Accept the main menu in the props. if not provided, the default main menu will be used.
• Accept the secondary menu in the props.
• Accept the user menu in the props.
• Restructure the user menu to add support for menu groups with heading in the user menu.
• Removed appMenu from DesktopHeader because its usage could not be found. (reference)(Please let me know if I am missing its usage)
• This will not affect the current usages of the frontend-component-header.

Screenshots of using custom headers for replicating different MFE headers.
Note: Screenshots are with local setup.

[codecov]

Codecov Report

Attention: Patch coverage is 93.33333% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 70.42%. Comparing base (abb08be) to head (e6aa4be).

Files	Patch %	Lines
src/DesktopHeader.jsx	94.73%	1 Missing ⚠️
src/Header.jsx	90.90%	0 Missing and 1 partial ⚠️
src/MobileHeader.jsx	93.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #466      +/-   ##
==========================================
+ Coverage   66.86%   70.42%   +3.55%     
==========================================
  Files          24       24              
  Lines         338      355      +17     
  Branches       78       88      +10     
==========================================
+ Hits          226      250      +24     
+ Misses        110      103       -7     
  Partials        2        2              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[zainab-amir]

@arbrandes Can you give an estimated time on when you will be able to review this PR?

[arbrandes]

@zainab-amir, I'll do my best to get to it today.

[syedsajjadkazmii]

Hi @arbrandes, waiting for your review on this PR. :)

[MaxFrank13]

Thanks for addressing all of the documentation nit picks! Approving from my end

[arbrandes]

I cannot find anything to object to: thanks for this, and apologies for the long delay in reviewing it!

[arbrandes]

For the record, I could not find any MFEs that use this, either.