Add megabits/s and gigabits/s as units of Rate

[jshughes]

Add more units of Rate: megabits/s and gigabits/s

🗒️ Summary

Added two new units of rate, megabits/s and gigabits/s, to unit_id in Units_of_Rates

🤖 AI Assistance Disclosure

• AI used for light assistance (e.g., suggestions, refactoring, documentation help, minor edits)

Estimated % of code influenced by AI: 10 %
Identify and debug Cucumber tests.

⚙️ Test Data and/or Report

github1065 - Added four validate tests: one control, two valid, and one invalid.

♻️ Related Issues

fixes #1065
refs #91

🤓 Reviewer Checklist

Reviewers: Please verify the following before approving this pull request.

Documentation and PR Content

• Documentation: README, Wiki, or inline documentation (Sphinx, Javadoc, Docstrings) have been updated to reflect these changes.
• Issue Traceability: The PR is linked to a valid GitHub Issue
• PR Title: The PR title is "user-friendly" clearly identifying what is being fixed or the new feature being added, that if you saw it in the Release Notes for a tool, you would be able to get the gist of what was done.

Security & Quality

• SonarCloud: Confirmed no new High or Critical security findings.
• Secrets Detection: Verified that the Secrets Detection scan passed and no sensitive information (keys, tokens, PII) is exposed.
• Code Quality: Code follows organization style guidelines and best practices for the specific language (e.g., PEP 8, Google Java Style).

Testing & Validation

• Test Accuracy: Verified that test data is accurate, representative of real-world PDS4 scenarios, and sufficient for the logic being tested.
• Coverage: Automated tests cover new logic and edge cases.
• Local Verification: (If applicable) Successfully built and ran the changes in a local or staging environment.

Maintenance

• Backward Compatibility: Confirmed that these changes do not break existing downstream dependencies or API contracts (or that breaking changes are clearly documented).

Terraform (only if this PR touches a terraform/ directory)

• Validator run: scripts/validate_terraform.py was run against the changed terraform/ tree and any Must-Have failures were resolved (or are tracked in a reviewed .tfvalidate-ignore entry, not silently bypassed).
• Ownership boundary: Shared/singleton CDS resources (Cognito, CloudFront, org-wide IAM roles, shared security groups) were only added/changed in pdc-cds-infra, not duplicated in an application repo.
• Module structure: modules/ stays flat and no new module is just a thin wrapper around a single resource.
• SSM interface: Any new cross-component output is actually published under /pds/<component>/... and, if this PR is the consumer side, reads from the correct published parameter rather than another repo's Terraform state.
• Naming intent: Resource and variable names are semantically meaningful, not just non-redundant (the validator only checks for repeated resource-type substrings).
• Auth at runtime: Terraform/CI actually authenticates via OIDC or an assumed role when applied — not just "no static key found in this diff."
• Least privilege: Any new or changed IAM policy attached to the Terraform execution role grants only what this change needs.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[jmafi]

I'm not sure what many of these files are (".pins", ".feature", ".pont", ".pprj"), but the diffs on them look to be in line with requested changes on CCB#91. The test labels also look good.