Add rate_limit.go test codes

[tomfrombayesians]

Description

It’s amazing to see a project like this in the Go ecosystem. Thanks for building this open source. We’re developing an open-source agent that automates code maintenance tasks, such as writing unit tests. Our project is currently private, but if you’re interested, you can sign up for our Beta Release Waitlist through this link

Since this is our first PR, we’ve added a simple test code without any associated issues. Looking forward to staying in touch!

Fixes # (No Issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Documentation change (pure documentation change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (non-breaking changes to code which doesn't change any behaviour)
• CI (any automation pipeline changes)
• Chore (changes which are not directly related to any business logic)
• Test changes (add, refactor, improve or change a test)
• This change requires a documentation update

What's Changed

• Add test code of (*RateLimit).AddStepRunId
• Add test code of (*RateLimit).Rollback

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