feat: use PluginSlot to add your site logo to studio footer

[Faraz32123]

use PluginSlot to add your site logo to studio footer.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.52%. Comparing base (655d6c0) to head (2c8cf2d).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #520      +/-   ##
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+ Coverage   91.22%   91.52%   +0.29%     
==========================================
  Files           5        6       +1     
  Lines          57       59       +2     
  Branches       19       19              
==========================================
+ Hits           52       54       +2     
  Misses          5        5              

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[brian-smith-tcril]

The current strategy for making the frontend more customizable is by using frontend-plugin-framework PluginSlots as opposed to adding new configuration variables (see https://discuss.openedx.org/t/plugin-slots-vs-configuration/13009)

As of openedx/frontend-app-authoring#1729, it is possible for site operators to replace the entire StudioFooter by utilizing the StudioFooterSlot - if that satisfies your use case then this PR can just be closed.

If you'd like a more granular approach (just replacing the "Powered by Open edX" logo/link), then updating this PR to wrap it in a new PluginSlot is another option.

[brian-smith-tcril]

Thanks for updating this to use a PluginSlot!

I left a comment about following the pattern we use in other places for plugin slots, if you could update this to do that it would be wonderful.

Thanks!

[brian-smith-tcril]

Thank you for being so patient with my reviews!

I left a couple more comments with some change requests, but this is looking super close to ready to go!

[brian-smith-tcril]

This is nearly perfect now!

Just one small naming thing and this will be ready to land!