[APM] Agent configuration: Bug makes it possible to create invalid configurations

[sorenlouv]

The following bug will enable a user to create a configuration with options that are not valid for the selected service.

Reproduce

• Click "Create configuration"
• Select any service (eg. opbeans-java) + environment (eg. production) and click "Next"
• Change a setting that is specific to the service (eg. circuit_breaker_enabled)
• Go to the top and click "Edit" to change the selected service or environment
• Change to a service that DOES NOT have the circuit_breaker_enabled option (eg. client) and click "Next"

Expected result:

• No options are filled out and it's not possible to save the configuration

Actual result

• No options are filled out but it's possible to click "Save Configuration"

[elasticmachine]

Pinging @elastic/apm-ui (Team:apm)