hopeful fix for flakey mr test

[gitdallas]

Description

thinking a possible reason for the failure (which i've never been able to reproduce locally) is that the dropdown menu gets clicked before it closes from the first selection.

originally tried a fix is to check for it to be closed before attempting to open it - but it was getting some "dom changed" error

this PR is now separating the two "unsupported platform" tests into their own so it doesn't have to deal with whatever issue is happening when flicking between two

Request review criteria:

Self checklist (all need to be checked):

• The developer has manually tested the changes and verified that the changes work
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has added tests or explained why testing cannot be added (unit or cypress tests for related changes)

After the PR is posted & before it merges:

• The developer has tested their solution on a cluster by using the image produced by the PR to main

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.31%. Comparing base (5d3efb2) to head (921bcf8).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3586      +/-   ##
==========================================
+ Coverage   85.20%   85.31%   +0.11%     
==========================================
  Files        1381     1391      +10     
  Lines       31592    31747     +155     
  Branches     8832     8867      +35     
==========================================
+ Hits        26919    27086     +167     
+ Misses       4673     4661      -12     

see 10 files with indirect coverage changes

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[mturley]

LGTM - hard to verify this really fixes the flake, but it's a harmless change if it doesn't and it seems logical that it would.

[openshift-ci]

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