Create NHG-based policer feature profile and remove deprecated test

[trlongth]

This PR adds a new feature profile for NHG-based policing using MATCH_ACTION in policy forwarding, and removes the deprecated ingress_police_nhg test. It includes the README with test cases and proposed schema.

[OpenConfigBot]

Pull Request Functional Test Report for #5327 / 1d9ee42

No tests identified for validation.

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request modernizes the QoS policing feature profiles by introducing a new approach to policing traffic based on Next-Hop Groups (NHG) using policy-forwarding with MATCH_ACTION. This change replaces an older, deprecated test, ensuring that the feature profiles reflect current best practices and hardware capabilities. The update provides clear documentation and schema examples for implementing and verifying NHG-based policing.

Highlights

• New Feature Profile: A new feature profile for NHG-based policing using MATCH_ACTION in policy forwarding has been introduced, aligning with modern hardware architectures for QoS.
• Deprecated Test Removal: The deprecated ingress_police_nhg test, including its README, Go test file, and metadata, has been removed.
• Updated Documentation: The new feature profile includes a comprehensive README detailing the summary, topology, test setup, procedure, test cases, and proposed OpenConfig schema for NHG-based policing.

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[gemini-code-assist]

Code Review

This pull request updates the DP-2.2 feature profile by replacing the legacy QoS classifier-based policing test with a modern approach using Policy-Forwarding MATCH_ACTION. The changes include deleting the old test files and introducing a new README that outlines the updated procedure and schema. The review feedback correctly identifies a JSON syntax error in the documentation examples and suggests including missing interface application details in both the canonical configuration snippet and the path coverage section to ensure completeness.