feat: add FeaturesProxy integration for feature flag management in CMS and LMS

[Akanshu-2u]

Description

Breaking change:
Operators who maintain custom settings modules that write to FEATURES must add the following snippet at the top of their settings file(s) to ensure backwards compatibility:

try:
    from openedx.core.lib.features_setting_proxy import FeaturesProxy
    FEATURES = FeaturesProxy(globals())
except ImportError:
    pass 

This allows existing references to FEATURES[...] to continue functioning while Open edX transitions off of it.

Reference:

• [DEPR]: Add FEATURES = FeaturesProxy(...) to your django settings openedx/edx-platform#37345

2U Private Jira Link :

• BOMS-200

[Copilot]

Pull Request Overview

This PR implements FeaturesProxy integration for feature flag management in both CMS and LMS configuration files. The changes introduce a backwards-compatible mechanism for transitioning away from direct FEATURES dictionary usage while maintaining existing functionality.

Key changes:

• Adds FeaturesProxy import and initialization in both CMS and LMS configuration files
• Implements try-catch blocks to handle ImportError gracefully for backwards compatibility
• Follows the exact pattern described in the breaking change documentation

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
py_configuration_files/lms.py	Adds FeaturesProxy integration with error handling for LMS configuration
py_configuration_files/cms.py	Adds FeaturesProxy integration with error handling for CMS configuration

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[jcapphelix]

@Akanshu-2u do we use "!" in commits when breaking changes are made internally ?

Can you also add 2U private jira link ?

[jcapphelix]

Can we add a comment that these changes are temporary and are supposed to be removed ?

[jcapphelix]

Can we add a comment that these changes are temporary and are supposed to be removed ?

Upon looking into the files these comments may not be needed as these are anyways internal implementation of devstack.py file so its okay to not have it there.