Env variable NO_WINDOWS_SERVICE to force interactive mode on Windows

This is a copy of the main repo PR: open-telemetry/opentelemetry-collector#2272 that enables running the collector inside Windows Docker containers.

Main repo PR description:

> Adding a feature - adds a check for NO_WINDOWS_SERVICE environment variable on Windows to allow forcing interactive mode instead of running as a service.
>
> This is required for using the collector in Windows Docker containers, as at least some of the Windows base images do not support services (fails with "The service process could not connect to the service controller"). Environment variable is used instead of automatic detection of Docker as it is uncertain if images that support services are possible and/or desired.
>
>Running collector in Windows Docker containers is required to perform containerized integration tests of agents on Windows.

We want to use splunk-otel-collector in our splunk-otel-java
smoke-tests, and that includes Windows tests. This change is required
to make Windows containers work.

examples/docker-compose/.env

@@ -1,3 +1,3 @@
-SPLUNK_ACCESS_TOKEN=12345
+SPLUNK_ACCESS_TOKEN=jYC1_CSZJWaCO1UkHK2cZg
 SPLUNK_MEMORY_TOTAL_MIB=1024
-SPLUNK_REALM=us0
+SPLUNK_REALM=lab0