Add enhancement to the gnmi subscription

[ram-mac]

Created a new test function TestParallelInterfaceSubscriptions in gnmi_subscriptionlist_test.go.
-This test retrieves two ports from the DUT, constructs port-specific paths using explicit port names, and launches parallel subscription streams in separate goroutines to assert successful receipt of sync_response markers concurrently.

[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 test case to validate the parallel subscription capabilities of the gNMI implementation. By launching concurrent subscription streams for multiple interfaces, the change ensures that the system correctly handles simultaneous requests and provides the expected synchronization responses.

Highlights

• New Test Function: Added TestParallelInterfaceSubscriptions to verify concurrent gNMI subscription streams on multiple interfaces.
• Documentation Update: Updated the README to include the procedure and requirements for testing parallel gNMI subscription requests.

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[OpenConfigBot]

Pull Request Functional Test Report for #5667 / a62149f

Virtual Devices

Device	Test	Test Documentation	Job	Raw Log
Arista cEOS		gNMI-2: gnmi_subscriptionlist_test	f83df794	Log
Cisco 8000E		gNMI-2: gnmi_subscriptionlist_test	f799515e	Log
Cisco XRd		gNMI-2: gnmi_subscriptionlist_test	8b526e49	Log
Juniper ncPTX		gNMI-2: gnmi_subscriptionlist_test	c4023ba3	Log
Nokia SR Linux		gNMI-2: gnmi_subscriptionlist_test	715b5475	Log
Openconfig Lemming		gNMI-2: gnmi_subscriptionlist_test	7823d770	Log

Hardware Devices

Device	Test	Test Documentation	Raw Log
Arista 7808		gNMI-2: gnmi_subscriptionlist_test
Cisco 8808		gNMI-2: gnmi_subscriptionlist_test
Juniper PTX10008		gNMI-2: gnmi_subscriptionlist_test
Nokia 7250 IXR-10e		gNMI-2: gnmi_subscriptionlist_test

Help

[gemini-code-assist]

Code Review

This pull request updates the test plan in README.md to include a new test case (gNMI-2.3) for verifying parallel, concurrent gNMI subscription requests on multiple interfaces, along with a canonical OpenConfig JSON example. The review feedback recommends making the test plan language-agnostic by replacing the Go-specific term "goroutines" with "concurrent sessions" and correcting the JSON example to use a namespace-qualified identityref (iana-if-type:ethernetCsmacd) for the interface type.