fix(ci): for UPF MR, use v2.1.0 SMF image

As discussed today with @tien-thinh.nguyen and @phine_stefan :

• Until the UPF QoS is released
• When it is an UPF MR, the SMF image to be used for testing is v2.1.0
• When it is a non-UPF MR, the SMF image to used for testing will the latest of develop or the SMF MR image. And the UPF image will be latest of develop as well.

Tagging @arora , @fmessaoudi , @phine_lukas

I've tested w/ RobotTest since I can emulate MR upstream triggering

• https://jenkins-oai.eurecom.fr/job/OAI-CN5G-RobotTest-Dev/93/console

  • It is a simulated SMF MR trigger:
  • docker pull selfix.sboai.cs.eurecom.fr/oai-smf:ci-tmp-pr-241-d4bc2a48
  • docker pull selfix.sboai.cs.eurecom.fr/oai-upf:develop-94f80419

• https://jenkins-oai.eurecom.fr/job/OAI-CN5G-RobotTest-Dev/94/console

  • It is a simulated UPF MR trigger:
  • docker pull selfix.sboai.cs.eurecom.fr/oai-smf:v2.1.0
  • docker pull selfix.sboai.cs.eurecom.fr/oai-upf:ci-tmp-pr-36-71c32f06

TODO: This commit will have to be reverted once QoS UPF branch is merged.