fix: disable invalid link Video Uploads

[DmytroAlipov]

This is the backport of the master.

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.
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, the link above is not functional, I recommend setting it to False by default.

Before:

After:

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[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.64 🎉

Comparison is base (a94942a) 74.53% compared to head (af203db) 75.17%.

Additional details and impacted files

@@                     Coverage Diff                      @@
##           open-release/palm.master     #513      +/-   ##
============================================================
+ Coverage                     74.53%   75.17%   +0.64%     
============================================================
  Files                           108      108              
  Lines                          2089     2091       +2     
  Branches                        514      516       +2     
============================================================
+ Hits                           1557     1572      +15     
+ Misses                          504      491      -13     
  Partials                         28       28              

Impacted Files	Coverage Δ
src/studio-header/Header.jsx	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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