RT-8 : Fix validation for breakout port check

[priyaranjannanda]

Changes to validate the breakout config for base test cases & reboot test cases

[gemini-code-assist]

Summary of Changes

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This pull request improves the robustness of the breakout port validation process in the singleton test suite. By replacing the existing PMD consistency check with a more detailed verification of hardware-port mappings and component configurations, the changes ensure that breakout modes are correctly applied and reflected in the device state. Additionally, a sleep interval was added to account for configuration propagation time, reducing potential flakiness in test execution.

Highlights

• Enhanced Validation Logic: Replaced the basic PMD verification with a comprehensive check that validates both hardware-port references and breakout configuration settings.
• Breakout Configuration Verification: Added specific logic to inspect breakout mode, group settings, number of breakouts, and speed for 400GBASE-DR4 ports.
• Test Stability: Introduced a 20-second delay after configuration to ensure breakout settings are fully applied before state verification begins.

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[OpenConfigBot]

Pull Request Functional Test Report for #5558 / 027f9ae

Virtual Devices

Device	Test	Test Documentation	Job	Raw Log
Arista cEOS		RT-8: Singleton with breakouts
Cisco 8000E		RT-8: Singleton with breakouts
Cisco XRd		RT-8: Singleton with breakouts
Juniper ncPTX		RT-8: Singleton with breakouts
Nokia SR Linux		RT-8: Singleton with breakouts
Openconfig Lemming		RT-8: Singleton with breakouts

Hardware Devices

Device	Test	Test Documentation	Raw Log
Arista 7808		RT-8: Singleton with breakouts
Cisco 8808		RT-8: Singleton with breakouts
Juniper PTX10008		RT-8: Singleton with breakouts
Nokia 7250 IXR-10e		RT-8: Singleton with breakouts

Help

[gemini-code-assist]

Code Review

This pull request updates the breakout test suite by renaming verifyConsistentPMD to verifyInterfaceHardwarePortAndBreakoutConfig and adding validation for breakout configurations on 400G ports. The reviewer's feedback highlights three key improvement opportunities: querying the operational state (.State()) instead of the configuration (.Config()) to ensure the breakout mode is applied, using gnmi.Lookup instead of testt.CaptureFatal to safely check for component names, and reusing the pre-fetched interfaces slice inside the loop to avoid redundant and inefficient gNMI GET requests.

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