Added id to namespace name generator

What does this MR do?

There were problems with flaky tests that fail at some point because they are trying to create a group which already exists with the same name. Since a group name is generated using a time stamp and tests are executed in parallel, there is a chance that a test is using the same timestamp as another. I added a simple fix that lowers the chance for this to happen by creating a random id that is added to the timestamp.

What are the relevant issue numbers?

31

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer