fix: add pluginManagement repositories to settings.gradle

Adds gradlePluginPortal() and mavenCentral() as plugin repositories
to ensure plugins can be resolved in restricted network environments
like the Azure DevOps 1ESPT pipeline agents.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: ramsessanchez

settings.gradle

@@ -1,3 +1,10 @@
+pluginManagement {
+    repositories {
+        gradlePluginPortal()
+        mavenCentral()
+    }
+}
+
 /*
  * This file was generated by the Gradle 'init' task.
  *