Some improvements to macOS CI

[ahmedihabb2]

Description

• Fix unused variables
• Fix Java and JNI paths to one installed via brew
• Avoid using bash_profile for setting env variables, now it's added to env file and sourced whenever we need it

Type of change

• New feature (non-breaking change which adds functionality)

Checklist:

• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have added tests/screenshots (if any) that prove my fix is effective or that my feature works.
• I have tested the tests implicated (if any) by my own code and they pass (make test or ctest -VV -R <test-name>).
• If my change is significant or breaking, I have passed all tests with ./docker-compose.sh test &> output and attached the