Cleanup: Remove parser switching logic (#6583)
Cleanup: Remove parser switching logic (#6583)

During the PromQL parser rewrite there was some logic put in place that allowed switching between the non generated and the generated parser. Since the parser is now fully generated this is not needed anymore.

Signed-off-by: Tobias Guggenmos <e4a4450e4651c64beb34964c0f3c164fefd114d7@redhat.com>
GoogleCloudPlatform/prometheus,alileza/prometheus,alileza/prometheus,keegancsmith/prometheus,kangwoo/prometheus,Gouthamve/prometheus,keegancsmith/prometheus,prometheus/prometheus,keegancsmith/prometheus,Gouthamve/prometheus,prometheus/prometheus,kangwoo/prometheus,alileza/prometheus,GoogleCloudPlatform/prometheus,keegancsmith/prometheus,kangwoo/prometheus,prometheus/prometheus,alileza/prometheus,GoogleCloudPlatform/prometheus,GoogleCloudPlatform/prometheus,kangwoo/prometheus,prometheus/prometheus,Gouthamve/prometheus,Gouthamve/prometheus,alileza/prometheus,GoogleCloudPlatform/prometheus,keegancsmith/prometheus,prometheus/prometheus