Fix convert2rhel tests by CVV sort and other fixes

[Gauravtalreja1]

Description:

1. For fetching latest CVV from CV we use index -1, and CVV list isn't sorted every time, so in such case, it tries to promote the older CVV which is already promoted and fails to promote again with below error.

2023-10-21 03:22:56 - nailgun.client - WARNING - Received HTTP 400 response: {"displayMessage":"Cannot promote environment out of sequence. Use force to bypass restriction.","errors":["Cannot promote environment out of sequence. Use force to bypass restriction."]}

2. Add workaround for CentOS 8 to fetch archived contents from new vault mirror, as its EOL in end of 2021 and existing mirror contents are now moved to vault mirror.
3. Use --releasever=8.4.2105 when updating packages using yum to avoid upgrading to latest CentOS 8.5, which causes C2R to fail later.

[Gauravtalreja1]

trigger: test-robottelo
pytest: tests/foreman/api/test_convert2rhel.py::test_convert2rhel_centos

[Gauravtalreja1]

trigger: test-robottelo
pytest: tests/foreman/api/test_convert2rhel.py::test_convert2rhel_centos

[Gauravtalreja1]

trigger: test-robottelo
pytest: tests/foreman/api/test_convert2rhel.py::test_convert2rhel_centos[centos8]
env:
  ROBOTTELO_content_host__centos8__vm__deploy_rhel_version: '8.5'

[Gauravtalreja1]

trigger: test-robottelo
pytest: tests/foreman/api/test_convert2rhel.py::test_convert2rhel_centos[centos8]
env:
  ROBOTTELO_content_host__centos8__vm__deploy_rhel_version: "'8.5'"

[ogajduse]

@Gauravtalreja1 you might want to try ROBOTTELO_content_host__centos8__vm__deploy_rhel_version: "@str 8.5"

[Gauravtalreja1]

trigger: test-robottelo
pytest: tests/foreman/api/test_convert2rhel.py::test_convert2rhel_centos[centos8]
env:
  ROBOTTELO_content_host__centos8__vm__deploy_rhel_version: "@str 8.5"

[Gauravtalreja1]

@ogajduse Thank you for the suggestion, but it didn't work either. I've opened a satqe-jenkins MR to bump this and it's merged, so will try that

[Gauravtalreja1]

trigger: test-robottelo
pytest: tests/foreman/api/test_convert2rhel.py::test_convert2rhel_centos[centos8]

[shweta83]

Ack.

[shubhamsg199]

Ack