feat: include usage locations in delete modal

[KristinAoki]

Description

This PR enhances the details in the files and videos delete confirmation. The new details clarify that deleting content can impact the rendering of the course if used in advanced settings, units, etc. Additional added a list of collapsible sections for the files/videos that are used in units so that users are aware that the files/videos that they are trying to delete might mess up content. This change impacts Authors.

Before

After

Supporting information

JIRA Ticket: TNL-10957

Testing instructions

1. Navigate to the Files page
2. Select a file to delete that is not used in a course
3. Should open delete confirmation with the file name is the title
4. Should not show the list of files that are used in the course
5. Click "Cancel"
6. Select a file to delete that is used in acourse
7. Should open delete confirmation with the file name is the title
8. Should show the list of files that are used in the course
9. Click "Cancel"
10. Select multiple files
11. Should number of selected files in the title
12. Should show files that are used in the course listed
13. Should not show files that are not used in the course

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.01%. Comparing base (99a144a) to head (355610c).
Report is 4 commits behind head on master.

❗ Current head 355610c differs from pull request most recent head c5dfbe3. Consider uploading reports for the commit c5dfbe3 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #938      +/-   ##
==========================================
+ Coverage   92.00%   92.01%   +0.01%     
==========================================
  Files         612      613       +1     
  Lines       10746    10761      +15     
  Branches     2305     2308       +3     
==========================================
+ Hits         9887     9902      +15     
  Misses        830      830              
  Partials       29       29              

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[connorhaugh]

LGTM just one nit