Move cypress-plugin-steps to optionalDependencies

[manaswinidas]

Moves cypress-plugin-steps to fix failing Konflux hermetic build downstream, as mentioned by DevOps team Slack thread here.

Description

How Has This Been Tested?

Test Impact

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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)

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• Included any necessary screenshots or gifs if it was a UI change.
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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 85.92%. Comparing base (c87c405) to head (bc106b1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3423   +/-   ##
=======================================
  Coverage   85.92%   85.92%           
=======================================
  Files        1338     1338           
  Lines       30283    30283           
  Branches     8356     8356           
=======================================
  Hits        26020    26020           
  Misses       4263     4263           

see 2 files with indirect coverage changes

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[lucferbux]

/lgtm

Good catch, that shouldn't been there from the start.

[openshift-ci]

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