[Java Extension] Disable Remote Configuration and Remove Unused Environment Variables

[duncanpharvey]

What does this PR do?

• Disables remote configuration
• Removes unused environment variables from the Java Extension
• Removes hardcoded Datadog Agent log level
• Adds comments for where environment variables are used

Motivation

https://datadoghq.atlassian.net/browse/SVLS-4763

• Prevent errors caused by persistent polling for remote-config state

  2024-04-29 18:49:56 UTC | TRACE | INFO | (pkg/config/remote/client/client.go:332 in pollLoop) | retrying the first update of remote-config state (could not acquire agent auth token: unable to read authentication token file: open C:\home\SiteExtensions\DevelopmentVerification.DdJava.Apm\v1_1_500068358-prerelease\Agent\auth_token: The system cannot find the file specified.)
  2024-04-29 18:49:57 UTC | TRACE | INFO | (pkg/config/remote/client/client.go:332 in pollLoop) | retrying the first update of remote-config state (could not acquire agent auth token: unable to read authentication token file: open C:\home\SiteExtensions\DevelopmentVerification.DdJava.Apm\v1_1_500068358-prerelease\Agent\auth_token: The system cannot find the file specified.)
  2024-04-29 18:49:58 UTC | TRACE | INFO | (pkg/config/remote/client/client.go:332 in pollLoop) | retrying the first update of remote-config state (could not acquire agent auth token: unable to read authentication token file: open C:\home\SiteExtensions\DevelopmentVerification.DdJava.Apm\v1_1_500068358-prerelease\Agent\auth_token: The system cannot find the file specified.)
  2024-04-29 18:49:59 UTC | TRACE | INFO | (pkg/config/remote/client/client.go:332 in pollLoop) | retrying the first update of remote-config state (could not acquire agent auth token: unable to read authentication token file: open C:\home\SiteExtensions\DevelopmentVerification.DdJava.Apm\v1_1_500068358-prerelease\Agent\auth_token: The system cannot find the file specified.)
  2024-04-29 18:50:00 UTC | TRACE | INFO | (pkg/config/remote/client/client.go:332 in pollLoop) | retrying the first update of remote-config state (could not acquire agent auth token: unable to read authentication token file: open C:\home\SiteExtensions\DevelopmentVerification.DdJava.Apm\v1_1_500068358-prerelease\Agent\auth_token: The system cannot find the file specified.)
  2024-04-29 18:50:01 UTC | TRACE | INFO | (pkg/config/remote/client/client.go:332 in pollLoop) | retrying the first update of remote-config state (could not acquire agent auth token: unable to read authentication token file: open C:\home\SiteExtensions\DevelopmentVerification.DdJava.Apm\v1_1_500068358-prerelease\Agent\auth_token: The system cannot find the file specified.)
  2024-04-29 18:50:02 UTC | TRACE | INFO | (pkg/config/remote/client/client.go:332 in pollLoop) | retrying the first update of remote-config state (could not acquire agent auth token: unable to read authentication token file: open C:\home\SiteExtensions\DevelopmentVerification.DdJava.Apm\v1_1_500068358-prerelease\Agent\auth_token: The system cannot find the file specified.)
  2024-04-29 18:50:03 UTC | TRACE | INFO | (pkg/config/remote/client/client.go:332 in pollLoop) | retrying the first update of remote-config state (could not acquire agent auth token: unable to read authentication token file: open C:\home\SiteExtensions\DevelopmentVerification.DdJava.Apm\v1_1_500068358-prerelease\Agent\auth_token: The system cannot find the file specified.)
  2024-04-29 18:50:04 UTC | TRACE | INFO | (pkg/config/remote/client/client.go:332 in pollLoop) | retrying the first update of remote-config state (could not acquire agent auth token: unable to read authentication token file: open C:\home\SiteExtensions\DevelopmentVerification.DdJava.Apm\v1_1_500068358-prerelease\Agent\auth_token: The system cannot find the file specified.)
  2024-04-29 18:50:05 UTC | TRACE | DEBUG | (pkg/trace/stats/concentrator.go:291 in flushNow) | Update oldestTs to 1714416590000000000

• Avoid confusion for what variables are used by the Tracer and the Agent for each runtime

Additional Notes

• Environment variables removed
  • DD_AGENT_PIPE_NAME
  • DD_DOGSTATSD_WINDOWS_PIPE_NAME
  • DD_TRACE_TRANSPORT
• Set DD_APM_REMOTE_TAGGER to false instead of 0 to avoid issues with boolean resolution in Java

Describe how to test/QA your changes

Run pipeline with RUNTIME=java and verify that the build script succeeds and the package deployed to self monitoring sends traces, runtime metrics, and custom metrics to Datadog.