K6_OTEL_EXPORTER_PROTOCOL

[codebien]

Feature Description

Change the K6_OTEL_EXPORTER_TYPE=http|grpc config variable to K6_OTEL_EXPORTER_PROTOCOL=http/protobuf|grpc to better align with OpenTelmetry guidelines as suggested here https://opentelemetry.io/docs/languages/sdk-configuration/otlp-exporter/#otel_exporter_otlp_protocol.

Suggested Solution (optional)

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Already existing or connected issues / PRs (optional)

#4571
#4070