Add deviation for SubinterfacePacketCountersMissing in Juniper

[priyaranjannanda]

The implementation will now skip all subinterface packet counter tests (InDiscards, InErrors, InMulticastPkts, OutDiscards, OutErrors, InFcsErrors) for Juniper, preventing the observed failures.

[gemini-code-assist]

Summary of Changes

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This pull request introduces a new deviation, SubinterfacePacketCountersMissing, to accommodate Juniper hardware that does not support subinterface packet counters. By updating the configuration metadata and adding a conditional skip in the relevant test suite, the change ensures that health checks remain robust and avoid false failures on affected platforms.

Highlights

• Added platform deviation: Included the subinterface_packet_counters_missing flag in the platform exceptions configuration to support Juniper devices.
• Updated test logic: Modified the system health check tests to skip subinterface packet counter verification when the new deviation is active.

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[OpenConfigBot]

Pull Request Functional Test Report for #5578 / 9d84445

Virtual Devices

Device	Test	Test Documentation	Job	Raw Log
Arista cEOS		Health-1.1: Generic Health Check
Cisco 8000E		Health-1.1: Generic Health Check
Cisco XRd		Health-1.1: Generic Health Check
Juniper ncPTX		Health-1.1: Generic Health Check
Nokia SR Linux		Health-1.1: Generic Health Check
Openconfig Lemming		Health-1.1: Generic Health Check

Hardware Devices

Device	Test	Test Documentation	Raw Log
Arista 7808		Health-1.1: Generic Health Check
Cisco 8808		Health-1.1: Generic Health Check
Juniper PTX10008		Health-1.1: Generic Health Check
Nokia 7250 IXR-10e		Health-1.1: Generic Health Check

Help

[gemini-code-assist]

Code Review

This pull request introduces a new deviation 'subinterface_packet_counters_missing' to skip subinterface packet counter tests when the deviation is enabled. The reviewer pointed out that calling 't.Skipf' directly within the 'subIntf' subtest will skip the entire subinterface test, obscuring other successful subtests like 'OperStatus', 'AdminStatus', and 'Description'. They suggested moving the deviation check inside the individual counter subtests or wrapping them in a nested 't.Run' block to ensure accurate test reporting.

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