[module-cleanup] Finatra 2.9 javaagent cleanup results

[github-actions]

Applied cleanup for instrumentation/finatra-2.9/javaagent in commit 1d1d4090.

• instrumentation/finatra-2.9/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/finatra/v2_9/FinatraRouteBuilderInstrumentation.java: qualified the FinatraSingletons.setCallbackClass(...) helper call instead of statically importing it. Reason: javaagent singleton-holder guidance says static imports should be reserved for stored singleton accessors and uppercase constant-like fields; verb helper methods that perform work should remain qualified.
• instrumentation/finatra-2.9/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/finatra/v2_9/FinatraRouteInstrumentation.java: qualified FinatraSingletons.updateServerSpanName(...), getCallbackClass(...), and setCallbackClass(...) helper calls for the same singleton-holder static import rule.

Validation completed: ./gradlew :instrumentation:finatra-2.9:javaagent:check, ./gradlew :instrumentation:finatra-2.9:javaagent:check -PtestLatestDeps=true, and ./gradlew spotlessApply.

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