Use camelCase for default `HealthReport` serialization in the TCP health probe

[stijnmoreels]

Is your feature request related to a problem? Please describe.
When serializing the HealthReport upon calling the TCP health probe, we don't use camelCase by default as JSON serialization settings.

Describe the solution you'd like
As we use by-default camelCase in the templates repo, we should make sure that we streamline consistency and also use camelCase here.