fix: Add env, service, version tags to fluentbit and cws containers

[gabedos]

What does this PR do?

Adds the environment variables DD_ENV, DD_SERVICE, and DD_VERSION to the fluentbit log router and the cws init tracer.

Motivation

Parity experience with DatadogECSFargate CDK construct. The Agent is already receiving these tags and adding them onto the other Agent related containers completes the experience.

Describe how you validated your changes

terraform apply and check for the environment variables on the tracer and log router

  dd_log_collection = {
    enabled = true,
  }

  dd_cws = {
    enabled = true,
  }

Additional Notes