Refactor ID handling and decouple Network Instance assignment

[priyaranjannanda]

• Ensuring that the InterfaceRefInterfaceIDFormat deviation only affects the naming of the interface (e.g., adding the .0 sub-interface suffix)

[gemini-code-assist]

Summary of Changes

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This pull request refactors how interface IDs are handled within the test suite to improve clarity and maintainability. By decoupling the network instance assignment from specific interface naming deviations, the code becomes more robust and easier to manage across different device configurations.

Highlights

• Network Instance Assignment: Removed the dependency on InterfaceRefInterfaceIDFormat for assigning interfaces to the default network instance.
• Interface ID Refactoring: Decoupled the interface naming logic from the ISIS interface retrieval, ensuring that the deviation only affects the interface name suffix.

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[OpenConfigBot]

Pull Request Functional Test Report for #5381 / 4f46aa3

Virtual Devices

Device	Test	Test Documentation	Job	Raw Log
Arista cEOS		RT-5.7: Aggregate Not Viable All
Cisco 8000E		RT-5.7: Aggregate Not Viable All
Cisco XRd		RT-5.7: Aggregate Not Viable All
Juniper ncPTX		RT-5.7: Aggregate Not Viable All
Nokia SR Linux		RT-5.7: Aggregate Not Viable All
Openconfig Lemming		RT-5.7: Aggregate Not Viable All

Hardware Devices

Device	Test	Test Documentation	Raw Log
Arista 7808		RT-5.7: Aggregate Not Viable All
Cisco 8808		RT-5.7: Aggregate Not Viable All
Juniper PTX10008		RT-5.7: Aggregate Not Viable All
Nokia 7250 IXR-10e		RT-5.7: Aggregate Not Viable All

Help

[gemini-code-assist]

Code Review

This pull request refactors the handling of the InterfaceRefInterfaceIDFormat deviation within the ISIS configuration and metric change functions to ensure consistent interface naming. It also simplifies the logic in the configureDUT function. A minor style issue was identified where a space is missing before an opening brace in an if statement, which violates the Go style guide.