Improving smoke test capabilities

[PerfectSlayer]

This PR was created to preview the end goal of the task. It is still early work and will be split into reviewable chunks once ready. Check additional notes for the PRs ready to review.

What Does This Do

This PR introduces smoke tests framework based on JUnit.

It provides the following capabilities:

• Register smoke applications
  • Either web server application or CLI application
  • Can be extended to new kind of applications too
  • Lifecycle handled as part of the JUnit engine
  • Registered for parameter resolution
• Provide full trace content and structure verification
  • With assert rules and matchers (similar to instrumentation testing)
• Receive traces from test agent
  • No longer test against our own instrumentation
  • Open to snapshot testing
  • Introduce test agent session support to tracer headers
• Rely on the existing CI test agent
  • Will run test agent locally if docker engine is found
  • Can run the old mock server as alternative when no docker env is available

Additionally, this PR ports two smoke tests as example:

• opentelemetry - a basic CLI app
• spring-boot-rabbit - a complex multiple apps / queues setup

Motivation

Additional Notes

This will make some tests run with the test agent side car and enable trace invariant gate too (check_test_agent_results.sh).

Related pull-requests ready for review:

• Add test agent session token support #12050

Contributor Checklist

• Format the title according to the contribution guidelines
• Assign the type: and (comp: or inst:) labels in addition to any other useful labels
• Avoid using close, fix, or any linking keywords when referencing an issue
  Use solves instead, and assign the PR milestone to the issue
• Update the CODEOWNERS file on source file addition, migration, or deletion
• Update public documentation with any new configuration flags or behaviors
• Once approved, use merge queue to merge the PR

Jira ticket: [APMLP-1247]