feat: add search menu button to header [FC-0040]

[rpenido]

Description

This PR adds a new "Search content" button in the Studio Header.
Desktop:

Mobile:

The icon is only shown if a searchButtonAction props is provided to the StudioHeader component.

More Information

Part of:

• [Course Search] Trigger Course Search Modal in Course Authoring MFE modular-learning#199

Testing Instructions

• Check the unit tests for this feature
• For manual testing, see the instructions in the following PR:
  • feat: add content search modal [FC-0040] frontend-app-authoring#928

---

Internal ref: FAL-3693

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.15%. Comparing base (10619ce) to head (154db29).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #474      +/-   ##
==========================================
+ Coverage   66.86%   67.15%   +0.29%     
==========================================
  Files          24       24              
  Lines         338      341       +3     
  Branches       78       80       +2     
==========================================
+ Hits          226      229       +3     
  Misses        110      110              
  Partials        2        2              

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[yusuf-musleh]

👍 Looks good @rpenido, great work!

• I tested this: I checked the test cases and manually tested its functionality as described in the PR description
• I read through the code
• I checked for accessibility issues
• Includes documentation

[bradenmacdonald]

@arbrandes or @brian-smith-tcril Would one of you have time this week to review and merge this small PR for us? We (OpenCraft) don't have any Core Contributor for this repo afaik. It's blocking some other work and required for the search feature that we want to get into Redwood.

[brian-smith-tcril]

The code LGTM!

Is this something the product/ui/ux WG is aware of? If we could either get a 👍 from them on this PR or a link to a something noting this UI change is approved that'd be perfect.

[jmakowski1123]

This has product approval, it's part of the larger content tagging initiative which has been ongoing since before product proposal operations were solidified.

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