Remove frontend unit test report test case sorting

What does this MR do?

For #228950 (closed)

We want the list of test cases in the unit test report to have a new default sort order, and this has now been implemented on the backend in !40722 (merged) 🎉 but since we had been sorting by status on the frontend, we now need to clean up the old code that was determining the sort order.

Technically, this MR removes the function we were using to sort the test cases and the spec that tests the frontend sorting.

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team