Reproduce issue with non-daemon threads spawned by datadog agent

iomain.scala

//> using dep "com.datadoghq:dd-trace-api:1.34.0"
//> using dep "org.typelevel::cats-effect:3.5.4"

import datadog.trace.api.civisibility.*
import cats.effect.*

object HelloIOApp extends IOApp.Simple {

  val run = IO.delay {
    println("Hello!")
    val testSession =
      CIVisibility.startSession("my-project-name", "my-test-framework", null)
    testSession.setTag("my-tag", "additional-session-metadata")
    val testModule = testSession.testModuleStart("my-module", null)
    val testSuite = testModule.testSuiteStart("my-suite", null, null)

    val ddTest = testSuite.testStart("myTestCase", null, null)
    ddTest.setTag("my-test-case-tag", "additional-test-case-metadata")
    ddTest.setTag("my-test-case-tag", "more-test-case-metadata")

    println("Executing fake test")

    ddTest.end(null)
    testSuite.end(null)
    testModule.end(null)
    testSession.end(null)
    println("Bye!")
  }
}