Windows CI: Do not pass Linux specific options for ENVOY_DOCKER_OPTIONS in pipeline

In https://github.com/envoyproxy/envoy/pull/13222 we collapsed the original Windows specific script to run an Envoy build in Docker into the Linux one. We found that the CI pipelines pass a Linux specific value for ENVOY_DOCKER_OPTIONS which of course are invalid for Windows.

We would like to be able to use the same mechanism ENVOY_DOCKER_OPTIONS for overriding options in Docker on Windows (for a uniform developer experience to allow CI/local builds to add options, particularly --storage-opt to allow for much larger disk space).

Currently ENVOY_DOCKER_OPTIONS is ignored on Windows to accommodate CI, but if we can change the variable groups in CI to not pass the Linux specific options to Windows, we can stop ignoring the variable.

The action item in this issue is to see if we can modify how Azure Pipelines is set up to run the various CI jobs so we can pass an empty/non-Linux specific value for the ENVOY_DOCKER_OPTIONS variable. This will enable us to add back the support for ENVOY_DOCKER_OPTIONS as a variable that can be used as part of the run_envoy_docker.sh script to modify how Docker is invoked.