cicd: disable fastfail for integration tests

I would want to see all failures on all images.
No reason to fail fast.

Author: dkropachev

.github/workflows/tests.yml

@@ -48,6 +48,7 @@ jobs:
     strategy:
       matrix:
         scylla-docker-version: ['latest', '6.2', '5.2']
+      fail-fast: false
 
     steps:
       - uses: actions/checkout@v5