tests: add MoE subgraph tests with require_full_compilation enforcement

[yizhuoz004]

Description

Add tests/py/dynamo/hlo/test_moe.py covering all 7 MoE routing and dispatch variants from popular open-source LLMs (Mixtral, Qwen2, Qwen3, Llama4, DeepSeek-V2, DeepSeek-V3/R1, Nemotron-H). 50 parameterized test cases verify TRT numerical correctness against PyTorch reference.

Extend DispatchTestCase.run_test() with require_full_compilation=True support: calls TRTInterpreter.validate_conversion() before building the engine and fails immediately if any op lacks a TRT converter. All MoE tests pass this check, confirming zero PyTorch fallback for every routing/dispatch/expert-MLP combination tested.

Fixes # (issue)

Type of change

Tests

Checklist:

• [x ] My code follows the style guidelines of this project (You can use the linters)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas and hacks
• I have made corresponding changes to the documentation
• I have added tests to verify my fix or my feature
• New and existing unit tests pass locally with my changes
• I have added the relevant labels to my PR in so that relevant reviewers are notified

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