[Cherry pick] feat: Show toast when exporting course tags

[ChrisChV]

Cherry pick of #995 to Redwood

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.29%. Comparing base (a88066a) to head (a0a88ee).

Additional details and impacted files

@@                       Coverage Diff                       @@
##           open-release/redwood.master    #1051      +/-   ##
===============================================================
+ Coverage                        92.28%   92.29%   +0.01%     
===============================================================
  Files                              708      708              
  Lines                            12494    12516      +22     
  Branches                          2712     2722      +10     
===============================================================
+ Hits                             11530    11552      +22     
  Misses                             927      927              
  Partials                            37       37              

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