Rename CI workflow

Author: EZoni

.github/workflows/unit_tests.yml renamed to .github/workflows/tests.yml

@@ -11,8 +11,8 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  unit_tests:
-    name: unit tests
+  tests:
+    name: tests
     runs-on: ubuntu-latest
     strategy:
       matrix: