feat: plugin slots for video and file upload components and alerts

[xitij2000]

Description

This change adds plugin slots for the file and video upload pages to allow developers to customise those components. It also adds empty slots allowing developers to add additional alerts.

Supporting information

NA

Testing instructions

TBD

Other information

This change is being made to support a feature where a client wants course authors to acknowledge fair use terms before they are allowed to upload files

[openedx-webhooks]

Thanks for the pull request, @xitij2000!

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[codecov]

Codecov Report

Attention: Patch coverage is 96.24060% with 5 lines in your changes missing coverage. Please review.

Project coverage is 92.97%. Comparing base (b110b6b) to head (9c79a41).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/files-and-videos/generic/EditFileErrors.jsx	69.23%	4 Missing ⚠️
src/plugin-slots/CourseVideosSlot/index.jsx	98.64%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1523   +/-   ##
=======================================
  Coverage   92.96%   92.97%           
=======================================
  Files        1075     1079    +4     
  Lines       21190    21218   +28     
  Branches     4554     4489   -65     
=======================================
+ Hits        19700    19727   +27     
- Misses       1424     1425    +1     
  Partials       66       66           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[kaustavb12]

👍

Left a minor nit. Otherwise LGTM.

• I tested this: Tested in local
• I read through the code

[kaustavb12]

Some spacing between the different hooks would make it more readable.