Add report generation for Nemotron Ultra (Uses Megatron-Run workload in CloudAI)

[srivatsankrishnan]

Summary

This PR adds a new MegatronRunReportGenerationStrategy class that parses Megatron-LM training logs to extract performance metrics for Design Space Exploration (DSE) and reporting purposes.

The existing MegatronRun workload only had CheckpointTimingReportGenerationStrategy which parses checkpoint save/load timing information. There was no support for extracting core training metrics like step time and GPU throughput from Megatron-LM iteration logs.

Test Plan

• CI/CD
• Real system runs

Additional Notes

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