add KNAPSACK_PRO_FIXED_QUEUE_SPLIT to workflow.yml

[craigrva]

Description

• Adds KNAPSACK_PRO_FIXED_QUEUE_SPLIT=true to the .workflow.yml file for Github Actions to enable re-running individual CI nodes in GHA jobs.
• Updates config option in spec_helper.rb due to the previous config option being deprecated and causing Knapsack Pro problems

Acceptance Criteria

• Code compiles correctly
• Individual CI nodes can be re-run via Github Actions and correctly run the Rspec tests from that node.

Testing

• Go to Actions run for this PR (Click checks above, then click on "Rspec Jest Lint Workflow")
• In the top right of the page, find the button which says "Latest 2"
• Click that button, then open "Attempt 1" in a new tab
• Compare the failing nodes on Attempt 1 with those in Latest 2 and verify that the same number of tests were run on each node of Attempt 1 and Latest 2
• If desired, click "Re-run Jobs" and then click "Re-run failing jobs". This will re-run the failing nodes and you when finished, you can verify the same data in the above step for each of the attempts that has been made

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[ajspotts]

lgtm!