Turns out relying on PWTRAP in stack is not reliable: depending on the
call structure, the stack might be cut unpredictably by Node.js.
This patch removes PWTRAP and instead plumbs explicit stack and
pre-set `apiName` all the way down to `wrapApiCall`.
Soft expects will still fail the test, but will not abort it's execution. As a consequence of this:
- `TestResult` now might have multiple errors, which is reflected with a new `testResult.erros: TestError[]` field.
- `TestInfo` now might have multiple errors as well, which is reflected with a new `testInfo.errors: TestError[]` field.
Fixes#7819
