A1-1-2.1: QL test testing behavior of response file do not work as expected

[jketema]

The test for rule A1-1-2.1 has a QL test for response files

https://github.com/github/codeql-coding-standards/blob/22c2da30db0c2de491c61cae397f1f537691d042/cpp/autosar/test/rules/A1-1-2.1/responsefile.cpp#L1

This is non-functional, as our testing framework skips over any file that doesn't have a common C or C++ extension. Hence, any options in the response file is ignored.