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

This reverts commit c35777a.

Author: elasticsearchmachine

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