RL training cudagraphs test

[mathemakitten]

What does this PR do ?

Adds tests/functional_tests/test_cases/gpt/gpt_grpo_tp1_pp1_dp8_583m_throughputtest_cudagraphs which is a copy of tests/functional_tests/test_cases/gpt/gpt_grpo_tp1_pp1_dp8_583m_throughputtest with --rl-training-cuda-graphs: true added. Requires #2452 to go in first.

This test is to check runnability only. The golden values are within 10% of the goldens copied from gpt_grpo_tp1_pp1_dp8_583m_throughputtest currently and the model size is very small.

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[thomasdhc]

LGTM

model size concerns