Remove obsolete "version" parameter from yaml files used on avra

- docker on CI machine avra was updated to version 26.0.0, which reports
  parameter "version" as obsolete
- this additional log causes fail of the container undeployment to stage

ci-scripts/yaml_files/5g_sa_n310_gnb/docker-compose.yml

-version: '3.8'
 services:
     oai-gnb:
         image: oai-gnb:latest

ci-scripts/yaml_files/sa_aw2s_gnb/docker-compose.yml

-version: '3.8'
 services:
     oai-gnb:
         image: oai-gnb-aw2s:latest