Add connectivity type tracking to endpoint consumption logic

[parveensania]

This PR updates the endpoint consumption logic in FanOutStreamingEngineWorkerHarness to trigger refreshes whenever the connectivity type changes, even if the metadata version remains the same.

Previously, the harness only refreshed endpoints if the metadata version increased. This change ensures the client immediately picks new endpoint types if backend settings change, without waiting for a version increment.

[gemini-code-assist]

Summary of Changes

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This pull request enhances the endpoint consumption logic within the streaming engine harness to be more responsive to backend connectivity changes. By tracking the connectivity type alongside the metadata version, the system can now proactively refresh endpoints when backend settings change, ensuring better connectivity management without relying solely on metadata version increments.

Highlights

• Connectivity Type Tracking: Introduced a new 'Type' enum in WindmillEndpoints to track connectivity types (e.g., CLOUDPATH, BORG, DIRECTPATH) and updated the endpoint consumption logic to trigger refreshes when this type changes, even if the metadata version remains the same.
• Refreshed Consumption Logic: Modified FanOutStreamingEngineWorkerHarness to track the active metadata type and ensure that endpoint updates are processed if either the version increases or the connectivity type changes.
• Stream Metadata Handling: Updated GrpcGetWorkerMetadataStream to remove the stale metadata check, allowing the harness to handle all incoming metadata updates and determine if they should be consumed based on the new logic.

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[arunpandianp]

do we need this version check? Seems like it is enough to check if metadata changed.