Adding new test for Port mirroring coverage in FNT

[ram-mac]

Add new test for coverage of Port Mirroring

• Adding README.md file which outlines the test procedure for local packet mirroring (to FILE action) across physical interfaces and LAG member ports in both ingress and egress directions
• Adding metadata.textproto which would outlines the TestID and other details

[OpenConfigBot]

Pull Request Functional Test Report for #5652 / f09caca

Virtual Devices

Device	Test	Test Documentation	Job	Raw Log
Arista cEOS		DP-1.18: Flow matching using ACL and to Port Mirror/Redirect	1e7e1618	Log
Cisco 8000E		DP-1.18: Flow matching using ACL and to Port Mirror/Redirect	231110cb	Log
Cisco XRd		DP-1.18: Flow matching using ACL and to Port Mirror/Redirect	119b7828	Log
Juniper ncPTX		DP-1.18: Flow matching using ACL and to Port Mirror/Redirect	0d5fffe8	Log
Nokia SR Linux		DP-1.18: Flow matching using ACL and to Port Mirror/Redirect	bb92d202	Log
Openconfig Lemming		DP-1.18: Flow matching using ACL and to Port Mirror/Redirect	a207392f	Log

Hardware Devices

Device	Test	Test Documentation	Raw Log
Arista 7808		DP-1.18: Flow matching using ACL and to Port Mirror/Redirect
Cisco 8808		DP-1.18: Flow matching using ACL and to Port Mirror/Redirect
Juniper PTX10008		DP-1.18: Flow matching using ACL and to Port Mirror/Redirect
Nokia 7250 IXR-10e		DP-1.18: Flow matching using ACL and to Port Mirror/Redirect

Help

[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 introduces a new automated test case for verifying packet mirroring functionality in the FNT environment. The test validates the ability to redirect traffic matching specific ACLs to a local file across various interface types, ensuring compliance with OpenConfig mirroring extensions.

Highlights

• New Test Coverage: Added a new test case for Port Mirroring functionality, covering ingress and egress scenarios on both physical interfaces and LAG member ports.
• Documentation and Metadata: Included a comprehensive README.md detailing the test procedure and a metadata.textproto file for test identification.
• Registry Update: Updated the test registry to include the link to the new test documentation.

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