prevent false positives in detecting internal errors

[c-herrewijn]

fixes: https://github.com/duckdblabs/duckdb-internal/issues/6745

duckdb uses exit status 1 for both regular and internal errors.

This PR applies the following logic (in order) do distinguish between regular and internal errors:

1. If the error string contains any of INTERNAL_ERROR_STRINGS -> always consider it an internal error
2. if the error string contains any of the INTERNAL_ERROR_FALSE_POSITIVES -> consider it NOT an internal error
3. if the error string contains string internal, consider it an internal error

Rule 3 can be considered a fall-back for ambiguous cases. In these cases, a potential false positive is preferred over a false negative