chore: checking the Java formatter test

[suztomo]

Does the Java formatter really run?
Looking at https://github.com/googleapis/java-shared-config/blob/f4daddb30447165f73e2b5d8bcb8436c684cf5fb/java-shared-config/pom.xml#L172,
it only be configured as pluginManagement and it doesn't seem to
be configured run in CI builds.

[suztomo]

It failed at "ci / lint":

[INFO] --- fmt:2.9:check (default-cli) @ google-cloud-core ---
[INFO] Processed 81 files (1 non-complying).
Error:  Found 1 non-complying files, failing build
Error:  To fix formatting errors, run "mvn com.coveo:fmt-maven-plugin:format"
Error:  Non complying file: /home/runner/work/sdk-platform-java/sdk-platform-java/java-core/google-cloud-core/src/main/java/com/google/cloud/Service.java

[suztomo]

The lint check already uses Java 11. https://github.com/googleapis/sdk-platform-java/actions/runs/13639131969/workflow?pr=3672#L199

Picking up a handwritten library java-storage, it also uses Java 11 for the lint job https://github.com/googleapis/java-storage/actions/runs/13636614376/workflow?pr=2970#L107 .