fix: disable invalid link Video Uploads

[DmytroAlipov]

Description

This PR is opened to solve the problem with an invalid link to the Video Uploads page. This question has already been asked here.

There are 2 cases:

• If the variable ENABLE_NEW_VIDEO_UPLOAD_PAGE is set to True, the link "/course/{courseId}/videos" is generated, and the page with the eternal loader is displayed.

• If the variable ENABLE_NEW_VIDEO_UPLOAD_PAGE is set to False, the link "{STUDIO_BASE_URL}/videos/{courseId}" is generated, and a 404 error is returned.

I suggest adding the variable ENABLE_VIDEO_UPLOAD_PAGE_LINK_IN_CONTENT_DROPDOWN to the .env file in order to control the visibility of this link. Since currently all the links mentioned above are not functional, I recommend setting it to False by default.

Result of this fix:

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[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.62 🎉

Comparison is base (fac9eab) 74.83% compared to head (e745f9d) 75.45%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #511      +/-   ##
==========================================
+ Coverage   74.83%   75.45%   +0.62%     
==========================================
  Files         110      110              
  Lines        2174     2176       +2     
  Branches      554      556       +2     
==========================================
+ Hits         1627     1642      +15     
+ Misses        519      506      -13     
  Partials       28       28              

Impacted Files	Coverage Δ
src/studio-header/Header.jsx	96.55% <100.00%> (+0.25%)	⬆️

... and 1 file with indirect coverage changes

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[mphilbrick211]

Hi @openedx/teaching-and-learning! This looks ready to review, and merge if all looks good. Thanks!

[openedx-webhooks]

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