ROX-28839 - Add RHCOS images to ARM integration tests

[robbycochran]

Description

Adds 4.12, 4.15, and 4.18 OCP versions of RHCOS to ARM integration tests.

Checklist

• Investigated and inspected CI test results
• Updated documentation accordingly

Automated testing

• Added unit tests
• Added integration tests
• Added regression tests

If any of these don't apply, please comment below.

Testing Performed

TODO(replace-me)
Use this space to explain how you tested your PR, or, if you didn't test it, why you did not do so. (Valid reasons include "CI is sufficient" or "No testable changes")
In addition to reviewing your code, reviewers must also review your testing instructions, and make sure they are sufficient.

For more details, ref the Confluence page about this section.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 27.51%. Comparing base (4de6015) to head (d4be0c2).

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2076   +/-   ##
=======================================
  Coverage   27.51%   27.51%           
=======================================
  Files          93       93           
  Lines        5728     5728           
  Branches     2534     2534           
=======================================
  Hits         1576     1576           
  Misses       3485     3485           
  Partials      667      667           

Flag	Coverage Δ
collector-unit-tests	27.51% <ø> (ø)

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