build: skip native tests for credentials module

The google-auth-library-java migration to the monorepo inadvertently enabled GraalVM native testing for the credentials module because the generic graalvm-single job type runs tests on all modules in the subdirectory. In the original repository, this job was carefully scoped to only test the oauth2_http module.

This change adds <skipNativeTests>true</skipNativeTests> to the credentials module POM to skip native tests, resolving the failure when the plugin cannot find test configuration files.

Fixes #12859

Author: meltsufin

google-auth-library-java/credentials/pom.xml

@@ -22,6 +22,13 @@
     <sourceDirectory>java</sourceDirectory>
     <testSourceDirectory>javatests</testSourceDirectory>
     <plugins>
+      <plugin>
+        <groupId>org.graalvm.buildtools</groupId>
+        <artifactId>native-maven-plugin</artifactId>
+        <configuration>
+          <skipNativeTests>true</skipNativeTests>
+        </configuration>
+      </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-source-plugin</artifactId>