[DRAFT] Add malleablec2 tests

[cgranleese-r7]

Note

In draft until 6.5 is green

Description

PR to add tests for the new MalleableC2 work. I wanted to add some tests to cover future regressions and update the existing tests suite to now have some additional payloads that use the new option.

Breaking Changes

None

Reviewer Notes

This likely wont pass until other PRs and merged into 6.5. #21656 for sure needs to be in the 6.5 tree before this will pass.

Verification Steps

1. • Tests go green
2. • Tests make sense

Test Evidence

N/A

Environment

Field	Details
Operating System	macOS 26.5.2

AI Usage Disclosure

Kiro

Pre-Submission Checklist

• Included a corresponding documentation markdown file in documentation/modules (new modules only)
• No sensitive information (IP addresses, credentials, API keys, hashes) in code or documentation
• Tested on the target environment specified in the Environment section above
• Included RSpec tests for library changes (encouraged for lib/ changes)
• Read the CONTRIBUTING.md and module acceptance guidelines