Add option to delete moderation notes

[blutarch]

Along with vanilla/internal#2485, this closes vanilla/support#1455.

This PR adds a checkbox option when deleting a user's content to choose whether to delete any moderation notes pertaining to the user's posts.

TO TEST

1. Create 2 users and add a moderation note for each one.
2. Check out both this branch and the add/delete-notes-check branch from vanilla/internal.
3. From dashboard/user, select the first user to delete using the trash can icon.
4. Choose 'Delete User Content'.
5. Leave the 'Delete moderation information' box unchecked and click 'Delete User Forever'.
6. Verify that the user is deleted, but the moderation note is still present (in the Gdn_UserNote table).
7. Repeat steps 2-4 with the second user.
8. This time, check the checkbox.
9. Verify that the moderation note is deleted.

[codecov]

Codecov Report

Merging #10529 into master will increase coverage by 0.05%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master   #10529      +/-   ##
============================================
+ Coverage     53.59%   53.64%   +0.05%     
+ Complexity     8282     3893    -4389     
============================================
  Files           371      373       +2     
  Lines         44288    44420     +132     
============================================
+ Hits          23736    23830      +94     
- Misses        20552    20590      +38     

Impacted Files	Coverage Δ	Complexity Δ
library/Vanilla/Web/Controller.php	71.73% <0.00%> (-8.86%)	0.00% <0.00%> (ø%)
...s/dashboard/controllers/api/MediaApiController.php	77.77% <0.00%> (-7.33%)	20.00% <0.00%> (-19.00%)
library/Vanilla/Models/VanillaMediaSchema.php	95.00% <0.00%> (-5.00%)	0.00% <0.00%> (ø%)
library/core/class.upload.php	41.37% <0.00%> (-4.03%)	0.00% <0.00%> (-69.00%)
library/Vanilla/Models/ThemeModel.php	49.54% <0.00%> (-3.40%)	0.00% <0.00%> (-76.00%)
library/Vanilla/Models/FsThemeProvider.php	75.15% <0.00%> (-3.17%)	0.00% <0.00%> (-56.00%)
library/Vanilla/Models/ThemePreloadProvider.php	55.42% <0.00%> (-2.69%)	35.00% <0.00%> (+6.00%)	⬇️
library/Garden/Web/Data.php	97.75% <0.00%> (-1.10%)	0.00% <0.00%> (ø%)
library/Vanilla/Models/ThemeModelHelper.php	74.64% <0.00%> (-1.07%)	0.00% <0.00%> (-27.00%)
...oard/controllers/api/AuthenticateApiController.php	83.27% <0.00%> (-0.27%)	62.00% <0.00%> (ø%)
... and 34 more