New JSON field in HTTP request collector if any

[nvanthao]

Description, Motivation and Context

Fixes: https://github.com/replicatedhq/troubleshoot/issues/1425

Checklist

• [x] New and existing tests pass locally with introduced changes.
• [x] Tests for the changes have been added (for bug fixes / features)
• [ ] The commit message(s) are informative and highlight any breaking changes
• [ ] Any documentation required has been added/updated. For changes to https://troubleshoot.sh/ create a PR here

Does this PR introduce a breaking change?

• [ ] Yes
• [x] No

[banjoh]

Is there a docs PR?

[nvanthao]

Hi @banjoh, yes I will update the doc and create a PR today.