Add test cases for gNMI union_replace

[dplore]

Updated README.md to clarify test cases for gNMI union_replace functionality, including idempotent configuration, addition, change, deletion, and movement of configurations.

[gemini-code-assist]

Summary of Changes

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This pull request updates the documentation for gNMI union_replace test cases. It clarifies the testing procedures for various configuration scenarios, ensuring consistent validation of device behavior when applying gNMI operations.

Highlights

• Documentation Update: Updated the README.md file to provide comprehensive test case definitions for gNMI union_replace functionality.
• Expanded Test Coverage: Added detailed steps for testing idempotent configurations, adding/changing/deleting configurations, and moving configurations between interfaces.

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[OpenConfigBot]

Pull Request Functional Test Report for #5299 / ad793c1

Virtual Devices

Device	Test	Test Documentation	Job	Raw Log
Arista cEOS		gNMI-3: union_replace	a5d5d188	Log
Cisco 8000E		gNMI-3: union_replace	9ba1d7c3	Log
Cisco XRd		gNMI-3: union_replace	00abaeb0	Log
Juniper ncPTX		gNMI-3: union_replace	6277c1e5	Log
Nokia SR Linux		gNMI-3: union_replace	95c51d16	Log
Openconfig Lemming		gNMI-3: union_replace	972f3a43	Log

Hardware Devices

Device	Test	Test Documentation	Raw Log
Arista 7808		gNMI-3: union_replace
Cisco 8808		gNMI-3: union_replace
Juniper PTX10008		gNMI-3: union_replace
Nokia 7250 IXR-10e		gNMI-3: union_replace

Help

[gemini-code-assist]

Code Review

This pull request updates the README.md for the union_replace_test to include a detailed test plan covering idempotent configurations, adding, changing, deleting, and moving configurations, as well as handling hardware mismatches. Feedback was provided to ensure consistent heading formats (gNMI-3.x.y), correct sequential numbering for test steps, and improved clarity in variable naming and test descriptions. Additionally, suggestions were made to remove protocol-specific parameters like the hold-timer from generic interface tests and to fix minor grammatical and capitalization errors.