Test may be presuming too much about AI operation IDs

When building with Application Insights 2.11, we get these errors:

```
Expected string length 55 but was 51. Strings differ at index 0.
Expected: "00-a080bab656ea934a9728001ad5135437-80505fb4142fb048-00"
But was: "|a080bab656ea934a9728001ad5135437.80505fb4142fb048."
```

This implies there has been some change in the ID format. The intention was for the tests to have no preconceived notions about how these IDs are structured, and just to check that things like parent/child relationships reflect the expected structure. So there's probably something not quite right in these tests.