[issue-1089] test(codegen): fix exception handling in NestedGroupDelimiterTest

The compilation error in NestedGroupDelimiterTest.java was fixed by replacing the catch of MojoExecutionException with CodeGenerationException and removing the unused import. All tests in the quickfixj-codegenerator module passed successfully after the fix. The change ensures correct exception handling matching the generator's behavior and preserves test assertions.

Author: junie-eap[bot]

quickfixj-codegenerator/src/test/java/org/quickfixj/codegenerator/NestedGroupDelimiterTest.java

@@ -7,7 +7,6 @@
 import java.nio.charset.StandardCharsets;
 
 import org.apache.commons.io.FileUtils;
-import org.apache.maven.plugin.MojoExecutionException;
 import org.junit.Before;
 import org.junit.Test;
 
@@ -52,7 +51,7 @@ public void generatesGroupWithDeeplyNestedDelimiter() throws Exception {
 
         try {
             generator.generate(task);
-        } catch (MojoExecutionException e) {
+        } catch (CodeGenerationException e) {
             // Surface with context for easier debugging in CI
             throw new AssertionError("Code generation failed: " + e.getMessage(), e);
         }