Fix DockerTests for dockerUbi (#91901) (#91907)

kill command was not available. bash -c with kill should be used
relates #91704
closes #91874

Co-authored-by: Elastic Machine <[email protected]>

Author: pgomulka

qa/os/src/test/java/org/elasticsearch/packaging/test/DockerTests.java

@@ -1230,7 +1230,7 @@ public void test600Interrupt() {
         final List<ProcessInfo> infos = ProcessInfo.getProcessInfo(sh, "java");
         final int maxPid = infos.stream().map(i -> i.pid()).max(Integer::compareTo).get();
 
-        sh.run("kill -int " + maxPid); // send ctrl+c to all java processes
+        sh.run("bash -c 'kill -int " + maxPid + "'"); // send ctrl+c to all java processes
         final Result containerLogsAfter = getContainerLogs();
 
         assertThat("Container logs should contain stopping ...", containerLogsAfter.stdout(), containsString("stopping ..."));