Fix interface.go and update BGP Scale

[Abdelfatah26]

Fix interface.go and update BGP Scale

[gemini-code-assist]

Summary of Changes

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This pull request introduces critical fixes to interface configuration and BGP scaling tests. It standardizes how interface enablement is handled across different platforms using specific deviations and improves the flexibility of BGP configuration by moving to a dynamic option-based approach. Additionally, it refines test reliability by upgrading error handling and updating metadata to reflect current platform requirements.

Highlights

• Interface Configuration Fixes: Updated interface configuration logic to use IPv4MissingEnabled deviation consistently across sub-interfaces and aggregate interfaces.
• BGP Scale Test Improvements: Refactored BGP global and peer group configuration to use slice-based options, allowing for conditional inclusion of features like EBGPMultipath based on vendor.
• Metadata Updates: Updated platform exceptions and deviations in metadata to better support specific hardware requirements and interface behaviors.
• Test Robustness: Changed error handling in port verification from t.Errorf to t.Fatalf to stop execution immediately on failure, and adjusted ISIS telemetry logging.

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[OpenConfigBot]

Pull Request Functional Test Report for #5439 / 8a76bf7

Virtual Devices

Device	Test	Test Documentation	Job	Raw Log
Arista cEOS		RT-1.65: BGP scale test	8bbc618c	Log
Cisco 8000E		RT-1.65: BGP scale test	b883b2e0	Log
Cisco XRd		RT-1.65: BGP scale test	3e82cdfc	Log
Juniper ncPTX		RT-1.65: BGP scale test	0353e0b9	Log
Nokia SR Linux		RT-1.65: BGP scale test	ba8e56af	Log
Openconfig Lemming		RT-1.65: BGP scale test	acd3e408	Log

Hardware Devices

Device	Test	Test Documentation	Raw Log
Arista 7808		RT-1.65: BGP scale test
Cisco 8808		RT-1.65: BGP scale test
Juniper PTX10008		RT-1.65: BGP scale test
Nokia 7250 IXR-10e		RT-1.65: BGP scale test

Help

[gemini-code-assist]

Code Review

This pull request refactors BGP and interface configuration logic by utilizing option slices in cfgplugins and adjusting the handling of the IPv4MissingEnabled deviation. It also updates test metadata and modifies the default LearnedLspFilter setting in shared OTG helpers. Review feedback identifies several instances of inverted logic regarding the IPv4MissingEnabled deviation and suggests that global changes to shared helper functions should be made configurable to prevent potential regressions in other tests.