Normalize Spark javaagent package name

[trask]

Part of

• Tracking package and module name alignment #18428

[Copilot]

Pull request overview

Normalizes the Spark 2.3 javaagent instrumentation package name so it aligns with the module/versioned directory structure (spark/v2_3) as part of the broader package/module name alignment work in #18428.

Changes:

• Updated package declarations from io.opentelemetry.javaagent.instrumentation.sparkjava to io.opentelemetry.javaagent.instrumentation.spark.v2_3 in the Spark 2.3 javaagent instrumentation classes.
• Updated package declarations in Spark 2.3 javaagent tests to match the new package.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
instrumentation/spark-2.3/javaagent/src/test/java/io/opentelemetry/javaagent/instrumentation/spark/v2_3/TestSparkJavaApplication.java	Aligns test helper class package with versioned Spark 2.3 instrumentation package.
instrumentation/spark-2.3/javaagent/src/test/java/io/opentelemetry/javaagent/instrumentation/spark/v2_3/SparkJavaBasedTest.java	Aligns test class package with versioned Spark 2.3 instrumentation package.
instrumentation/spark-2.3/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/spark/v2_3/SparkRouteUpdater.java	Aligns production helper class package with versioned Spark 2.3 instrumentation package.
instrumentation/spark-2.3/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/spark/v2_3/SparkInstrumentationModule.java	Aligns instrumentation module SPI class package with versioned Spark 2.3 instrumentation package.
instrumentation/spark-2.3/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/spark/v2_3/RoutesInstrumentation.java	Aligns ByteBuddy instrumentation class package with versioned Spark 2.3 instrumentation package.