Add reference URL to ScubaResults.json

[adhilto]

🗣 Description

Add the link to the group markdown anchor (see screenshot) to the ScubaResults.json file.

💭 Motivation and context

Closes #1118.

🧪 Testing

Ran against a test tenant and verified that both the links in the HTML and the links in the json worked as expected.

✅ Pre-approval checklist

• This PR has an informative and human-readable title.
• PR targets the correct parent branch (e.g., main or release-name) for merge.
• Changes are limited to a single goal - eschew scope creep!
• Changes are sized such that they do not touch excessive number of files.
• All future TODOs are captured in issues, which are referenced in code comments.
• These code changes follow the ScubaGear content style guide.
• Related issues these changes resolve are linked preferably via closing keywords.
• All relevant type-of-change labels added.
• All relevant project fields are set.
• All relevant repo and/or project documentation updated to reflect these changes.
• Unit tests added/updated to cover PowerShell and Rego changes.
• Functional tests added/updated to cover PowerShell and Rego changes.
• All relevant functional tests passed.
• All automated checks (e.g., linting, static analysis, unit/smoke tests) passed.

✅ Pre-merge checklist

• PR passed smoke test check.

• Feature branch has been rebased against changes from parent branch, as needed

  Use Rebase branch button below or use this reference to rebase from the command line.

• Resolved all merge conflicts on branch

• Notified merge coordinator that PR is ready for merge via comment mention

✅ Post-merge checklist

• Feature branch deleted after merge to clean up repository.
• Verified that all checks pass on parent branch (e.g., main or release-name) after merge.

[schrolla]

Update works as intended. Existing group links still work, and group reference URL is shown to be available in the ScubaResults.json when Invoke-Scuba is run with -MergeJSON as expected.
Minor recommendation to make var more specific, but approving as it is not a critical path change. If there is time to update, test, and verify though, please do so.

[adhilto]

@nanda-katikaneni Ready for merge