fix(tests): Make the cypress apps management test more reliable

[nickvergessen]

Summary

I was able to reproduce most failures that I found for the apps.cy.ts test by adding sleeps in the right places:

• The app could not be found in the app list

  • 

  • Add sleep(7); as first line in

    server/apps/settings/lib/Controller/AppSettingsController.php

    Line 246 in b64ab5f

    publicfunctionlistApps(): JSONResponse {

• Enabling the app took longer then loading the list of enabled apps
  • Add sleep(7); as first line in

    server/apps/settings/lib/Controller/AppSettingsController.php

    Line 438 in b64ab5f

    publicfunctionenableApps(array$appIds, array$groups = []): JSONResponse {

• Disabling the app took longer then loading the list of disabled apps
  • Add sleep(7); as first line in

    server/apps/settings/lib/Controller/AppSettingsController.php

    Line 500 in b64ab5f

    publicfunctiondisableApps(array$appIds): JSONResponse {

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[nickvergessen]

/backport to stable28