Remove thunder from default executors

[Priya2698]

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[greptile-apps]

Greptile Summary

Removed thunder from the DEFAULT_EXECUTORS list in benchmarks/python/core.py, reducing the default benchmark executors from ["eager", "torchcompile", "thunder"] to ["eager", "torchcompile"].

• This affects all benchmark tests that use @pytest.mark.parametrize("executor", DEFAULT_EXECUTORS) - they will no longer automatically run with the thunder executor
• All thunder functionality remains intact (imports, with_executor function still supports "thunder" and "thunder-torchcompile")
• Thunder can still be used explicitly when needed

The change is clean, focused, and maintains backward compatibility for explicit thunder usage.

Confidence Score: 5/5

• This PR is safe to merge with no risk
• Single-line configuration change that removes thunder from default executors while preserving all functionality. No logic changes, no breaking changes, and all thunder support remains available for explicit use.
• No files require special attention

Important Files Changed

Filename	Overview
benchmarks/python/core.py	Removed thunder from DEFAULT_EXECUTORS list while preserving all thunder functionality for explicit use

_{Last reviewed commit: 35e76dd}

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