Add flag to start jfr recording

Author: sarahchen6

dd-smoke-tests/spring-boot-3.0-native/src/test/groovy/SpringBootNativeInstrumentationTest.groovy

@@ -51,6 +51,7 @@ class SpringBootNativeInstrumentationTest extends AbstractServerSmokeTest {
       "-Ddd.trace.debug=true",
       "-Ddd.jmxfetch.statsd.port=${statsdPort}",
       "-Ddd.jmxfetch.start-delay=0",
+      "-XX:StartFlightRecording=filename=${testJfrDir}/recording.jfr",
     ])
     ProcessBuilder processBuilder = new ProcessBuilder(command)
     processBuilder.directory(new File(buildDirectory))