feature: ci: Add regression testing based on output file hashes

• Rewrites "runFileTest.sh" and renames it "filedma_test.sh"
• Introduces subdirectory test/data/.sha256/ to store hashes for past versions of SCDAQ with "correct" outputs.
  • The files have the following naming format: {file_prefix}_{number of bytes heading the output file that have been hashed}_{version commit number}
  • The current "gold standard" is 67ddf197 (January 9th, 2024, just after migration to the CMake meta-build system).
• Calculates hashes of the outputs following test runs and compares them to the hashes stored in the hash directory.
• Output-based tests fail when the hashes do not match for the same number of initial bytes.