Assign errors found in CI build to proper categories

[psmyrek]

📝 Provide a description of the improvement

Currently the scripts/continuous-integration-script.js assigns all errors found during CI build as unit tests errors, because the add method is always called on the unitTests set. It should be changed to something like failedChecks[ checkName ].add( packageName );

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[pomek]

Fixed in the past,

ckeditor5/scripts/continuous-integration-script.js

Line 138 in 768466c

failedChecks[ checkName ].add( packageName );