chore: Expose custom bash cmds

[ko3n1g]

What does this PR do ?

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Changelog

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Additional Information

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Summary by CodeRabbit

Release Notes

• New Features
  • Added --custom_bash_cmds CLI option (short: -cb) to specify custom bash commands for performance experiments, enabling users to execute additional bash commands during job setup.

[coderabbitai]

📝 Walkthrough

Walkthrough

The changes add support for custom bash commands in the performance testing framework by introducing a new CLI argument --custom_bash_cmds and propagating it through the setup_experiment module to the Slurm executor.

Changes

Cohort / File(s)	Summary
CLI Argument Definition scripts/performance/argument_parser.py	Added new --custom_bash_cmds / -cb argument accepting a comma-separated list of strings with default empty list.
Parameter Propagation scripts/performance/setup_experiment.py	Updated main() function signature to accept custom_bash_cmds: List[str] parameter and propagated it to slurm_executor and __main__ invocations.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'chore: Expose custom bash cmds' directly relates to the main changeset, which adds a new custom_bash_cmds parameter across the performance scripts.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Test Results For Major Changes	✅ Passed	PR exposes existing custom_bash_cmds feature by threading parameter through CLI and function signatures to already-implemented capability in slurm_executor.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch ko3n1g/chore/expose-custom-bash-cmds

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