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Description

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Fixes # (issue)

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• 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
• I have added tests that prove my feature, policy, or fix is effective and works
• New and existing tests pass locally with my changes

Generated description

Below is a concise technical summary of the changes proposed in this PR:

Adds proxy support for git clone operations and refactors proxy-related functionality. Introduces a new function get_proxy_envs() to handle proxy environment variables. Updates the ProxyClient class to use environment variables from env_vars_config. Moves the call_http_request_with_proxy function to a more centralized location.