CSUB-1345: Replace Azure VMs with Linode VMs for runtime-upgrade CI jobs

[atodorov]

Description of proposed changes

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Practical tips for PR review & merge:

• All GitHub Actions report PASS
• Newly added code/functions have unit tests
  • Coverage tools report all newly added lines as covered
  • The positive scenario is exercised
  • Negative scenarios are exercised, e.g. assert on all possible errors
  • Assert on events triggered if applicable
  • Assert on changes made to storage if applicable
• Modified behavior/functions - try to make sure above test items are covered
• Integration tests are added if applicable/needed

[github-actions]

For full LLVM coverage report click here!

[atodorov]

NOTE: https://github.com/gluwa/creditcoin3/actions/runs/11743345590/job/32728998589?pr=522 failed because the underlying VM was removed by https://github.com/gluwa/creditcoin3-next/actions/runs/11748027127/job/32731230248 b/c it has been over 5 hrs since the VM was launched.