[chores] Separated session redis bucket from cache bucket

[nemesifier]

Checklist

• I have read the OpenWISP Contributing Guidelines.
• I have manually tested the changes proposed in this pull request.
• N/A I have written new test cases for new code and/or updated existing tests for changes to existing code.
• N/A I have updated the documentation.

Reference to Existing Issue

Not needed, small improvement being done in all repositories.

Description of Changes

Small improvement to the test env which separates cache from session storage to avoid terminating sessions when clearing the cache.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 2c3d11b3-8911-4d1e-8612-584d7478b737

📥 Commits

Reviewing files that changed from the base of the PR and between 44ef8f8 and c438725.

📒 Files selected for processing (1)

• images/common/openwisp/settings.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch separate-session-storage

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