Add JMX contract tests

[jefchien]

Description of changes: Adds contract tests to verify the expected behavior of the following changes:

• https://github.com/aws-observability/aws-otel-java-instrumentation/pull/817
• https://github.com/aws-observability/aws-otel-java-instrumentation/pull/898
• https://github.com/aws-observability/aws-otel-java-instrumentation/pull/901

Starts up sample apps with the instrumented SDK and verifies that metrics are received for each of the supported JMX target systems.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.