Previously, reporter would look for a stack frame directly in the test file.
Often times, that is not a top stack frame, especially when the test uses
some helper functions.
This changes error snippets and locations to use the top frame. When top
frame does not match the test file, we additionally show the location
to avoid confusion:
```
1) a.spec.ts:7:7 › foobar ========================================================================
Error: oh my
at helper.ts:5
3 |
4 | export function ohMy() {
> 5 | throw new Error('oh my');
| ^
6 | }
7 |
at ohMy (.../reporter-base-should-print-codeframe-from-a-helper/helper.ts:5:15)
at .../reporter-base-should-print-codeframe-from-a-helper/a.spec.ts:8:9
at FixtureRunner.resolveParametersAndRunHookOrTest (.../src/fixtures.ts:281:12)
```
