[Build] Cache spotless p2 dependencies when baking ci image (elastic#118523) (elastic#118591)

The eclipse formatter used by spotless is resolved at runtime and not declared as
gradle dependency. Therefore we need to run the spotless task to ensure we have
the dependencies resolved as part of our ci image baking.

This should avoid issues with connecting to p2 repos we have experienced lately
in our ci environment

* Revert "[Build] Declare mirror for eclipse p2 repository (elastic#117732)"

This reverts commit c35777a.

Author: breskeby

build-conventions/src/main/java/org/elasticsearch/gradle/internal/conventions/precommit/FormattingPrecommitPlugin.java

@@ -17,8 +17,6 @@
 import org.gradle.api.Project;
 
 import java.io.File;
-import java.util.Arrays;
-import java.util.Map;
 
 /**
  * This plugin configures formatting for Java source using Spotless
@@ -66,8 +64,7 @@ public void apply(Project project) {
                 java.importOrderFile(new File(elasticsearchWorkspace, importOrderPath));
 
                 // Most formatting is done through the Eclipse formatter
-                java.eclipse().withP2Mirrors(Map.of("https://download.eclipse.org/", "https://mirror.umd.edu/eclipse/"))
-                    .configFile(new File(elasticsearchWorkspace, formatterConfigPath));
+                java.eclipse().configFile(new File(elasticsearchWorkspace, formatterConfigPath));
 
                 // Ensure blank lines are actually empty. Since formatters are applied in
                 // order, apply this one last, otherwise non-empty blank lines can creep

build.gradle

@@ -294,7 +294,10 @@ allprojects {
     if (project.path.contains(":distribution:docker")) {
       enabled = false
     }
-
+    if (project.path.contains(":libs:cli")) {
+      // ensure we resolve p2 dependencies for the spotless eclipse formatter
+      dependsOn "spotlessJavaCheck"
+    }
   }
 
   plugins.withId('lifecycle-base') {