[Flink-39425] [flink-metrics-otel] OpenTelemetryEventReporter logger fix for missing service.name

[SameerDevgon]

What is the purpose of the change

OpenTelemetryEventReporter logger has a missing init method call this means the service.name and service.version config options, defined in OpenTelemetryReporterOptions, are silently ignored for the event reporter. The resource field in OpenTelemetryReporterBase remains as Resource.getDefault() (which sets service.name = unknown_service:java), and that default is then baked into the SdkLoggerProvider at construction time.

Brief change log

• OpenTelemetryEventReporter call to super method of OpenTelemetryReporterBase that will merge the resource config (service.name)

Verifying this change

This change added tests and can be verified as follows:

(example:)

• Added integration tests for validating service.name is correctly added into logs
• Added unit test that validates the loggers to have the resource service.name value

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (no)
• The serializers: (no)
• The runtime per-record code paths (performance sensitive): (no)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (no)
• The S3 file system connector: (no)

Documentation

• Does this pull request introduce a new feature? (no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)

[flinkbot]

CI report:

• 370a64a Azure: SUCCESS

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[spuru9]

cc: @paras-negi-flink