Skip checkstyle in Build opentelemetry java instrumentation step

[liustve]

Description of changes:
PR builds are failing:
https://github.com/aws-observability/aws-otel-java-instrumentation/actions/runs/18234501009/job/51925394400

    Reason: Task ':smoke-tests:images:quarkus:checkstyleMain' uses this output of task ':smoke-tests:images:quarkus:compileQuarkusGeneratedSourcesJava' without declaring an explicit or implicit dependency. This can lead to incorrect results being produced, depending on what order the tasks are executed.
    
    Possible solutions:
      1. Declare task ':smoke-tests:images:quarkus:compileQuarkusGeneratedSourcesJava' as an input of ':smoke-tests:images:quarkus:checkstyleMain'.
      2. Declare an explicit dependency on ':smoke-tests:images:quarkus:compileQuarkusGeneratedSourcesJava' from ':smoke-tests:images:quarkus:checkstyleMain' using Task#dependsOn.
      3. Declare an explicit dependency on ':smoke-tests:images:quarkus:compileQuarkusGeneratedSourcesJava' from ':smoke-tests:images:quarkus:checkstyleMain' using Task#mustRunAfter.

This is because the checkstyle task dependency issues where checkstyle uses outputs from compileQuarkusGeneratedSourcesJava without declaring explicit dependencies, causing "implicit dependency" errors. Since we're only testing patch behavior and need functional artifacts published to Maven local, code style validation is unnecessary overhead that can be safely skipped.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.