Add files actions testing

[skjnldsv]

• [x] Sidebar action
• [x] Delete action
• [x] Download action
• [x] Open folder action

Coverage

Coverage is broken, see https://github.com/jestjs/jest/pull/14207 But here is the results, all 4 actions now have 100%

-----------------------------|---------|----------|---------|---------|-------------------------------------------------------------
File                         | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s                                           
-----------------------------|---------|----------|---------|---------|-------------------------------------------------------------
All files                    |   88.39 |    76.05 |   83.92 |    88.7 |                                                             
 apps/dav/src/views          |   70.58 |       50 |   16.66 |   70.58 |                                                             
  CalDavSettings.vue         |   70.58 |       50 |   16.66 |   70.58 | 128-320                                                     
 apps/files/src/actions      |     100 |    95.45 |     100 |     100 |                                                             
  deleteAction.ts            |     100 |      100 |     100 |     100 |                                                             
  downloadAction.ts          |     100 |       80 |     100 |     100 | 38                                                          
  openFolderAction.ts        |     100 |      100 |     100 |     100 |                                                             
  sidebarAction.ts           |     100 |      100 |     100 |     100 |                                                             
 apps/files/src/services     |   65.95 |    55.88 |   73.33 |    65.9 |                                                             
  FileAction.ts              |   65.95 |    55.88 |   73.33 |    65.9 | 117-121,126,130,134,138,143,147,151,155,159,163,177-178,185 
 apps/files_sharing/src/lib  |     100 |      100 |     100 |     100 |                                                             
  SharePermissionsToolBox.js |     100 |      100 |     100 |     100 |                                                             
 core/src/OC                 |     100 |      100 |     100 |     100 |                                                             
  requesttoken.js            |     100 |      100 |     100 |     100 |                                                             
-----------------------------|---------|----------|---------|---------|-------------------------------------------------------------

[skjnldsv]

/compile amend /