numpy>=2.0 and openmdao upgrade; tests, CI and devenv improvements

• numpy>=2.0 port changes
• openmdao latest version port changes
• pyoptsparse still doens't support numpy>=2.0. Hoping they are going to merge the upgrade soonish... For now, only the latest python3.12 is going to test against numpy>=2.0 by excluding pyoptsparse from the environment and tests
• pytest-xdist parallelization improvement, test time is reduced significantly :)
• pre-commit notebook strip changes so we have fewer lines changed in the notebooks and in MR we can see the actual diff lines rather than metadata changes
• moved the testing of all python version to a separate manual job in CI, so the MR pipelines can give quick response and the full suite can be run manually on main branch
• Developer docs note on pre-commit usage
• Added osx-[64|arm64] for pixi to resolve and make sure macOS users can recreate the environment

Closes #118