Remove unused metron_endpoint.dropsonde_port property

[acrmp]

Description

• Remove unused BOSH property metron_endpoint.dropsonde_port and associated config field from traffic controller
• Pass GRPCAddress rather than UDPAddress when creating a test server. gRPC-Go v1.52.0+ will error if the provided endpoint is empty: passthrough: return error if endpoint is empty and opt.Dialer is nil when building resolver grpc/grpc-go#5732

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Testing performed?

• Unit tests
• Integration tests
• Acceptance tests

Checklist:

• This PR is being made against the main branch, or relevant version branch
• I have made corresponding changes to the documentation
• I have added testing for my changes

If you have any questions, or want to get attention for a PR or issue please reach out on the #logging-and-metrics channel in the cloudfoundry slack

[ctlong]

LGTM!

Should this be marked as a breaking change?

[acrmp]

Should this be marked as a breaking change?

I don't think it's a breaking change as I don't believe the property has been effective since traffic controller switched to using gRPC for metrics in this story.