chore: make validator stressor configuration on runtime and load

[rootfs]

Setting max runtime so that we can reduce runtime on AWS instances.

[github-actions]

🤖 SeineSailor

Here's a concise summary of the pull request changes:

Summary: This pull request introduces dynamic validator stressor configuration at runtime, allowing for adjustable total runtime and customizable load curves.

Key Modifications:

1. Added load_curve variable with "default" and "stepwise" options.
2. Introduced total_runtime_seconds and curve_type configuration options.
3. Modified Validator class with new stressor attribute and instance variables.
4. Updated run() function to interact with load_curve variable.

Impact: These changes enhance the internal behavior of the Validator class, making it more flexible and configurable. The external interface remains consistent, ensuring backward compatibility.

Observations:

• The changes are well-contained within the Validator class and its related modules, minimizing the impact on the broader codebase.
• The addition of command-line options for total runtime adjustment is a nice touch, providing more flexibility for users.
• It would be beneficial to include tests that cover the different load curve configurations to ensure the changes work as intended.

Overall, this pull request introduces a valuable feature that enhances the validator's capabilities without disrupting the existing codebase.