Fix: Added additional information in logging of collector rollouts

[BominRahmani]

{
  "level":"info",
  "ts":"2024-09-25T11:31:29.779-0500",
  "logger":"config manager",
  "caller":"observiq/agent_config_manager.go:161",
  "msg":"Applying changes to config file",
  "config":"collector.yaml"
}

This log says specifies config:"collector.yaml" - it caused confusion with a customer. In short, the ConfigMap given by OpAMP calls this config "collector.yaml", but the actual config on-disk is "config.yaml". Might want to modify this somehow to reduce confusion (e.g. change key to opamp-config or confmap-config or something to specify that it's not the on-disk config. Including the on-disk config here might also help).

In essence this PR clarifies this by updating the log message.
Here is the updated log

{"level":"info","ts":"2025-02-10T11:12:57.615-0500","logger":"config manager","caller":"observiq/agent_config_manager.go:161","msg":"Applying changes to config file","OpAMPConfig":"collector.yaml","OnDiskCollectorConfig":"local/config.yaml"}

Proposed Change

Checklist

• Changes are tested
• CI has passed