Removed DEFAULT_HASHING_ALGORITHM from lms

[jawad-khan]

Description

Removed unused deprecated DEFAULT_HASHING_ALGORITHM django settings from repo.

Useful information to include:

• This will not effect any user.

Supporting information

This PR solves issue

Deadline

"None"

[Copilot]

Pull request overview

This PR removes the deprecated DEFAULT_HASHING_ALGORITHM Django setting from the edx-platform repository. This setting was previously used to control session hash algorithms but is no longer needed after upgrading to Django 4.x where the setting no longer applies.

Key changes:

• Removed DEFAULT_HASHING_ALGORITHM setting from all configuration files
• Removed legacy hash verification code that handled fallback to older hashing algorithms
• Cleaned up related test methods that validated hash algorithm switching behavior

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
openedx/envs/common.py	Removed deprecated DEFAULT_HASHING_ALGORITHM='sha256' setting
cms/envs/common.py	Removed deprecated DEFAULT_HASHING_ALGORITHM='sha256' setting
lms/envs/mock.yml	Removed DEFAULT_HASHING_ALGORITHM: sha256 configuration
cms/envs/mock.yml	Removed DEFAULT_HASHING_ALGORITHM: sha256 configuration
openedx/core/djangoapps/safe_sessions/tests/test_middleware.py	Removed test code wrapping verification with DEFAULT_HASHING_ALGORITHM setting
openedx/core/djangoapps/cache_toolbox/tests/test_middleware.py	Removed test helper method and test cases for hash algorithm switching; removed unused imports
openedx/core/djangoapps/cache_toolbox/middleware.py	Removed monitoring of DEFAULT_HASHING_ALGORITHM and legacy hash verification fallback logic

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