Snow 2306184 ng config support 3

[sfc-gh-mraba]

Pre-review checklist

• I've confirmed that instructions included in README.md are still correct after my changes in the codebase.
• I've added or updated automated unit tests to verify correctness of my new code.
• I've added or updated integration tests to verify correctness of my new code.
• I've confirmed that my changes are working by executing CLI's commands manually on MacOS.
• I've confirmed that my changes are working by executing CLI's commands manually on Windows.
• I've confirmed that my changes are up-to-date with the target branch.
• I've described my changes in the release notes.
• I've described my changes in the section below.
• I've described my changes in the documentation.

Changes description

This PR refactors the Snowflake CLI configuration management by removing the module-level CONFIG_MANAGER singleton and replacing it with a factory-based approach managed through the CliGlobalContext. This change improves testability and eliminates test flakiness caused by shared global state.

[graphite-app]

The property _version_cache_file is now a method rather than a class variable, but it's still being evaluated immediately during initialization when assigned to self._cache_file. This defeats the purpose of lazy evaluation.

Consider modifying this approach to truly implement lazy loading:

def __init__(self):
    self._cache_file = None  # Initialize as None

@property
def _cache_file(self):
    if self.__cache_file is None:
        self.__cache_file = self._version_cache_file
    return self.__cache_file

@_cache_file.setter
def _cache_file(self, value):
    self.__cache_file = value

This way, the property is only evaluated when first accessed, not during initialization.

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[sfc-gh-jwilkowski]

I left 1 important question about connections_file_override which does not seem to be needed (maybe yet?). Otherwise a general comment would be about recurring issues across this PR:

• lots of local imports, where I don't think most of them would cause circular deps
• lots of comments that don't add much value
• I've seen this pattern repeating several times - maybe path resolver could go into SecurePath so that we can avoid repeating those?

# Resolve Windows short paths to prevent cleanup issues
resolved_tmp_dir = path_resolver(tmp_dir)
config_path = Path(resolved_tmp_dir) / "config.toml"

Otherwise, looks great!