feat(telemetry): Support both new and deprecated OpenTelemetry runtime metrics #1026
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What this PR does
This commit enables Varlog to support both new and deprecated OpenTelemetry
runtime metrics.
Previously, Varlog only supported the deprecated runtime instrumentation. This
change ensures backward compatibility by simultaneously setting the
OTEL_GO_X_DEPRECATED_RUNTIME_METRICS
environment variable and using the newversion.
This enhancement allows Varlog to leverage the latest OpenTelemetry features
while maintaining compatibility with older versions, collecting more
comprehensive runtime metrics.