Remove redundant switch case in messageValueField.generateAccessors (#4774)
Remove redundant switch case in messageValueField.generateAccessors (#4774)

The env var `structOriginFullName` is not used in `accessorsMessageValueTemplate`, removing the redundant switch case
open-telemetry/opentelemetry-collector,open-telemetry/opentelemetry-collector,open-telemetry/opentelemetry-collector