Add routerLabels to Receive router service

[michael-burt]

• [ ] I added CHANGELOG entry for this change.
• [x] Change is not relevant to the end user.

Changes

This PR updates the Thanos Receive router service to include the routerLabels included on other router resources. It also reformats the ports section and adds assertions that also exist for other service port declarations.

Verification

I test this in a cluster and verified that it works.