gRIBI scale: enable fec level 3 on Arista

[dracazacula]

Enabling fec level3 reduces dramatically the HW utilization for level1 and level2.

[gemini-code-assist]

Summary of Changes

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This pull request updates the Arista device initialization configuration to enable hierarchical next-hop level 3. This change is intended to significantly reduce hardware utilization for FEC levels 1 and 2, improving overall gRIBI scaling performance.

Highlights

• Arista Configuration Update: Enabled hierarchical next-hop level 3 for Arista devices to optimize FIB and hardware utilization.

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[OpenConfigBot]

Pull Request Functional Test Report for #6027 / c51e39d

No tests identified for validation.

Help

[gemini-code-assist]

Code Review

This pull request updates the aristaOptimizeFIBAndCounters configuration string in internal/cfgplugins/dut_initialize.go to include the ip hardware fib hierarchical next-hop max-level 3 command. There are no review comments, and I have no feedback to provide.