Add ci.opensearch.org/m2/ mirror for plugin resolution (flow-framework)

Signed-off-by: shreyah963 <shreyab963@gmail.com>

Author: shreyah963

build.gradle

@@ -54,6 +54,7 @@ buildscript {
 
     repositories {
         mavenLocal()
+        maven { url = "https://ci.opensearch.org/m2/" }
         maven { url = "https://ci.opensearch.org/maven2/" }
         maven { url = "https://ci.opensearch.org/ci/dbc/snapshots/maven/" }
         mavenCentral()
@@ -186,6 +187,7 @@ java {
 
 repositories {
     mavenLocal()
+    maven { url = "https://ci.opensearch.org/m2/" }
     maven { url = "https://ci.opensearch.org/maven2/" }
     maven { url = "https://ci.opensearch.org/ci/dbc/snapshots/maven/" }
     mavenCentral()

settings.gradle

@@ -1,5 +1,6 @@
 pluginManagement {
     repositories {
+        maven { url "https://ci.opensearch.org/m2/" }
         maven { url "https://ci.opensearch.org/maven2/" }
         gradlePluginPortal()
         mavenCentral()