ci: add fail-fast: false to test matrix so failing platform does not cancel others

Author: nattb8

.github/workflows/ui-tests.yml

@@ -327,6 +327,7 @@ jobs:
     name: Run ${{ matrix.targetPlatform }} UI tests 🧪
     needs: build
     strategy:
+      fail-fast: false
       matrix:
         include:
           - targetPlatform: StandaloneOSX