Update integTest gradle scripts to run via remote cluster independently

Signed-off-by: Subhobrata Dey <sbcd90@gmail.com>

alerting/build.gradle

@@ -198,6 +198,31 @@ integTest {
     }
 }
 
+task integTestRemote(type: RestIntegTestTask) {
+    testClassesDirs = sourceSets.test.output.classesDirs
+    classpath = sourceSets.test.runtimeClasspath
+    systemProperty 'tests.security.manager', 'false'
+    systemProperty 'java.io.tmpdir', opensearch_tmp_dir.absolutePath
+
+    systemProperty "https", System.getProperty("https")
+    systemProperty "security", System.getProperty("security")
+    systemProperty "user", System.getProperty("user")
+    systemProperty "password", System.getProperty("password")
+
+    if (System.getProperty("tests.rest.cluster") != null) {
+        filter {
+            includeTestsMatching "org.opensearch.alerting.resthandler.*IT"
+        }
+    }
+
+    if (System.getProperty("https") == null || System.getProperty("https") == "false") {
+        filter {
+            excludeTestsMatching "org.opensearch.alerting.resthandler.Secure*IT"
+        }
+    }
+}
+integTestRemote.enabled = System.getProperty("tests.rest.cluster") != null
+
 String bwcVersion = "1.13.1.0"
 String baseName = "alertingBwcCluster"
 String bwcFilePath = "src/test/resources/bwc"