Update opentelemetry collector config to read appinsights string from… (#7825)

* Update opentelemetry collector config to read appinsights string from environment and add more logging.
* Also remove that line that cats in the appinsights connection string, since we can just use normal environment injection.

Author: LarryOsterman

tools/stress-cluster/services/otelcollector/otel-collector-config.yml

@@ -19,10 +19,10 @@ service:
     logs:
       receivers: [otlp]
       processors: [batch]
-      exporters: [azuremonitor]
+      exporters: [logging, azuremonitor]
 
 exporters:
   logging:
-    verbosity: normal
+    verbosity: detailed
   azuremonitor:
-#    connection_string: "%APPLICATIONINSIGHTS_CONNECTION_STRING%"
+    connection_string: "${env:APPLICATIONINSIGHTS_CONNECTION_STRING}"

tools/stress-cluster/services/otelcollector/startup.sh

@@ -3,5 +3,4 @@
 set -ex
 
 source $ENV_FILE
-echo "    connection_string: \"$APPLICATIONINSIGHTS_CONNECTION_STRING\"" >> /otel-collector-config.yml
 /otelcol-contrib --config otel-collector-config.yml $@