[exporter/kafka] move franz-go feature gate to stable, remove Sarama code

[axw]

Component(s)

exporter/kafka

Describe the issue you're reporting

The franz-go feature gate has been in Beta since v0.135.0, I think it's had enough baking time to move it to Stable. I propose we do that, and give it 2 releases before removing the feature gate altogether.

opentelemetry-collector-contrib/exporter/kafkaexporter/kafka_exporter.go

Lines 34 to 44 in 6ea6290

	const franzGoClientFeatureGateName = "exporter.kafkaexporter.UseFranzGo"
	// franzGoClientFeatureGate is a feature gate that controls whether the Kafka exporter
	// uses the franz-go client or the Sarama client. When enabled, the Kafka exporter
	// will use the franz-go client, which is more performant and has better support for
	// modern Kafka features.
	var franzGoClientFeatureGate = featuregate.GlobalRegistry().MustRegister(
	franzGoClientFeatureGateName, featuregate.StageBeta,
	featuregate.WithRegisterDescription("When enabled, the Kafka exporter will use the franz-go client to produce messages to Kafka."),
	featuregate.WithRegisterFromVersion("v0.128.0"),
	)

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[github-actions]

Pinging code owners for exporter/kafka: @pavolloffay @MovieStoreGuy @axw @paulojmdias. See Adding Labels via Comments if you do not have permissions to add labels yourself. For example, comment '/label priority:p2 -needs-triage' to set the priority and remove the needs-triage label.

[github-actions]

Pinging code owners:

• exporter/kafka: @pavolloffay @MovieStoreGuy @axw @paulojmdias

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[paulojmdias]

@axw please assign it to me, I can work on it 🙏

[axw]

Thanks @paulojmdias :)