Remove Flag Driven ProxyRunner Functionality from ToolHive Operator

[ChrisJBurns]

We are now using the RunConfig via a ConfigMap when using the ToolHive Operator. This further results in not needing the flag driven approach that we used to take with the ProxyRunner. Instead the Operator uses RunConfigs via ConfigMaps and mounts the config file as a file into the ProxyRunner container.

This issue will track the effort of removing the old flag driven code from inside the Operator.