CI: Remove redundant Jenkinsfiles

All the removed files can be replaced by Jenkinsfile introduced in !3738 (merged)

TODO:

• check that all pipelines use ci-scripts/Jenkinsfile
• all pipelines work as expected with ci-scripts/Jenkinsfile
  • 4G pipelines:
  • RAN-PhySim-Cluster-4G
  • RAN-RF-Sim-Test-4G
  • RAN-L2-Sim-Test-4G
  • RAN-LTE-FDD-LTEBOX-Container (ci-scripts/Jenkinsfile-tmp-multi-enb-nsa)
  • RAN-LTE-FDD-OAIUE-OAICN4G-Container
  • RAN-LTE-TDD-2x2-Container (ci-scripts/Jenkinsfile-tmp-multi-enb-nsa)
  • RAN-LTE-TDD-LTEBOX-Container (ci-scripts/Jenkinsfile-tmp-multi-enb-nsa)
  • 5G pipelines:
  • RAN-PhySim-Cluster-5G (ci-scripts/Jenkinsfile-physim-deploy)
  • RAN-PhySim-GraceHopper-5G
  • RAN-RF-Sim-Test-5G (ci-scripts/Jenkinsfile-tmp-ran)
  • OAI-FLEXRIC-RAN-Integration-Test
  • RAN-NSA-B200-Module-LTEBOX-Container (ci-scripts/Jenkinsfile-tmp-multi-enb-nsa)
  • RAN-SA-B200-Module-SABOX-Container (ci-scripts/Jenkinsfile-tmp-multi-enb-nsa)
  • RAN-gNB-N300-Timing-Phytest-LDPC (ci-scripts/Jenkinsfile-tmp-full-ran)
  • RAN-SA-AW2S-CN5G (ci-scripts/Jenkinsfile-physim-deploy)
  • RAN-SA-AERIAL-CN5G (ci-scripts/Jenkinsfile-physim-deploy)
  • RAN-SA-2x2-Module-CN5G
  • RAN-SA-FHI72-CN5G (ci-scripts/Jenkinsfile-physim-deploy)
  • RAN-SA-Handover-CN5G (ci-scripts/Jenkinsfile-physim-deploy)
  • RAN-SA-OAIUE-CN5G
  • Builders:
  • RAN-Ubuntu18-Image-Builder (ci-scripts/Jenkinsfile-tmp-ran)
  • RAN-RHEL8-Cluster-Image-Builder (ci-scripts/Jenkinsfile-cluster)
  • RAN-Ubuntu-ARM-Image-Builder (ci-scripts/Jenkinsfile-tmp-ran)
  • RAN-ARM-Cross-Compile-Builder (ci-scripts/Jenkinsfile-tmp-ran)
  • RAN-Ubuntu-Jetson-Image-Builder (ci-scripts/Jenkinsfile-tmp-ran)
  • RAN-cppcheck (ci-scripts/Jenkinsfile-tmp-ran)