[backport] Include route params in RpcHttp instance when http proxying is enabled. #9997

[kshyju]

backporting #9997

Pull request checklist

IMPORTANT: Currently, changes must be backported to the in-proc branch to be included in Core Tools and non-Flex deployments.

• Backporting to the in-proc branch is not required
  • Otherwise: Link to backporting PR
• My changes do not require documentation changes
  • Otherwise: Documentation issue linked to PR
• My changes should not be added to the release notes for the next release
  • Otherwise: I've added my notes to release_notes.md
• My changes do not need to be backported to a previous version
  • Otherwise: Backport tracked by issue/PR #issue_or_pr
• My changes do not require diagnostic events changes
  • Otherwise: I have added/updated all related diagnostic events and their documentation (Documentation issue linked to PR)
• I have added all required tests (Unit tests, E2E tests)

Additional information

Additional PR information

[fabiocav]

Any changes required when backporting, or was the commit coming in as-is?

[kshyju]

Any changes required when backporting, or was the commit coming in as-is?

Cherry picking the commit as it is. In this change, we don't use any language features which does not work for .NET6. Do you see any issues?

[fabiocav]

Cherry picking the commit as it is. In this change, we don't use any language features which does not work for .NET6. Do you see any issues?

No issues. Just checking if there was anything else that required attention.