Allow user to opt into Python shell integration even when they are using Python version 3.13 or above.

If user chooses to opt into python shell integration setting, we should use context.environmentVariableCollection.replace('PYTHON_BASIC_REPL', '1'); to disable PyREPL since enabling it currently leads to weird cursor error.

Otherwise, do not inject the environment variable to disable PyREPL for 3.13 and above.