Fix ci: ensure we have a supported ghc version in PATH

[jneira]

• A recent github workflows vm update set ghc to 9.2.1 in Linux, and hls does not support it
• This pr uses haskell/actions/setup to explicitly set a supported ghc version (9.0.1)
• In the way i added some improvements to help to debug the issue:
  • The client log output is written in the log file is the config option is specified
  • Client log output has a more verbose level: debug
  • Tests use the log file contents to make checks, it is included in the workflow step and uploaded as artifact if the test suite fails

/cc @jacobprudhomme, as i have modified some of the code recently added in your pr