Improve CheckDashboardHasResourcesAsync in workload tests

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Describe the bug

`CheckDashboardHasResourcesAsync` has some improvements I'd like to see to make it less brittle to changes and improve the error message output.

### Expected Behavior

* Asserts are hardcoded to cell position and number. The test will break if the number or order of columns changes. I'd like the test to get cells using something other than position. Perhaps we can give each cell a class to look up. Or if that isn't possible, then embed content in divs with classes. I think it's ok to make some modest changes to the generated HTML to make testing better.
* If a row's content doesn't match the expected content, then the test doesn't match the row and skips adding it to found rows. But that means the error message just says that the resource wasn't found. It doesn't say exactly what didn't match for the row (e.g. the wrong number of endpoints). Knowing why it didn't match would be useful.

### Steps To Reproduce

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### Exceptions (if any)

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### .NET Version info

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### Anything else?

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