Forward cache bypass header from website to Mixer

[rohitkumarbhagat]

• Forward a canonical X-Skip-Cache: true header to Mixer for valid cache-bypass requests
• Ensure cache bypass requests skip both website and Mixer caches.
• Add tests covering valid and invalid header values.

[gemini-code-assist]

Summary of Changes

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This pull request introduces functionality to propagate cache bypass requests from the website layer to the Mixer service. By forwarding the 'X-Skip-Cache' header, the system ensures consistent cache skipping behavior across the architecture, improving cache invalidation control for specific requests.

Highlights

• Cache Bypass Header Forwarding: Implemented logic to forward the 'X-Skip-Cache' header from website requests to the Mixer service.
• Header Normalization: Ensured that the 'X-Skip-Cache' header value is normalized to lowercase 'true' when forwarded.
• Testing: Added unit tests to verify that valid 'X-Skip-Cache' headers are correctly forwarded and invalid values are ignored.

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[gemini-code-assist]

Code Review

This pull request updates the get_basic_request_headers function to forward the X-Skip-Cache header to the mixer service when should_skip_cache() evaluates to true. It also adds corresponding unit tests to verify this behavior. The feedback suggests parameterizing the new unit tests to more comprehensively cover various valid and invalid header values.