Overhaul `chiaEnvironment.js`

[ChiaMineJP]

This PR fixed some issues

• Fixed an issue where the GUI did not launch when chia executable extension is .cmd, not .exe on Windows.
• Fixed an issue where VIRTUAL_ENV env var was ignored. (Always used fixed venv path (../../../venv/) instead)
• Previously, the GUI ignores if chia version fails. (meaning chia executable is broken). Now it raises an Error if chia version fails.
• Previously, the GUI ignores if chia init fails. (meaning chia executable is broken). Now it raises an Error if chia init fails.
• There were redundant variables.
  • PY_MAC_DIST_FOLDER and PY_WIN_DIST_FOLDER are the same so merging them into a single constant.
  • PY_DIST_EXEC_ARGS and PY_DEV_EXEC_ARGS are the same so merging them into a single constant.
• There was a small chance that the GUI changes its guessing for packaging in a process lifetime.
• There were multiple guessPackaged() callings. In fact, it's only needed to be called once only to get dir path.