Vulnerabilities integration tests

[jyang2139]

🗣 Description

Added integration testing for Vulnerabilities endpoint for get, put, post.

💭 Motivation and context

Integration tests were created by building on existing unit and integration tests. These tests ensure that the GET, PUT, and POST methods work correctly and that the system components interact as expected.

🧪 Testing

✅ Pre-approval checklist

• This PR has an informative and human-readable title.
• Changes are limited to a single goal - eschew scope creep!
• I have read the CONTRIBUTING document.
• These code changes follow cisagov code standards.
• All relevant repo and/or project documentation has been updated
  to reflect the changes in this PR.
• Tests have been added and/or modified to cover the changes in this PR.
• All new and existing tests pass.

✅ Pre-merge checklist

• Revert dependencies to default branches.

✅ Post-merge checklist

• Create a release.

[JCantu248]

Looks good, but lets rerun the pre-commit hooks locally. Theres some linter errors that need to be resolved locally. Then add the files, commit, and push again.

The code looks good. I'll work on resolving some of these environment search values and integrating them into Github Actions.