Deleting Multiple tests from an active test run is extremely slow

[s-leavens]

Describe the bug
If you multi-select a number of tests from a test run and click delete, testomat deletes them one-by-one which is very slow if you've selected a number of tests.

To Reproduce
Steps to reproduce the behavior:

1. Go to an active test run
2. Click the multi-select button
3. Select multiple tests
4. Click Delete

Expected behavior
All selected tests would delete at once

Desktop (please complete the following information):

• OS: Mac OS
• Browser: Chrome
• Browser Version: 151.0.7922.170