[Test] Stacktrace doesn't use filenames for test files

[jribbink]

Current Behavior

When an error is returned for a location in a test file, the location of the file in the stack trace is hard to understand. I.e. it should be test_mytest.cdc instead of a string of numbers

Expected Behavior

Align the name of the file with the actual system filename

Steps To Reproduce

Create an error inside of a test file

Environment

- Cadence version: 0.32.5
- Network: Test framework

[m-Peter]

@jribbink Nice idea :clap: