Tests job updated in Workflow (safe-global#836)

Previously we only checked coverage using `npm run coverage` which I
believe only checked `hardhat test --network hardhat`, thus not checking
the rest of the types of test based on L1, L2 and ZK. This adds another
job in the CI which checks for the same.

.github/workflows/ci.yml

@@ -30,6 +30,18 @@ jobs:
             - run: npm run lint:ts
 
     tests:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v4
+            - uses: actions/setup-node@v4
+              with:
+                  node-version: ${{ env.NODE_VERSION }}
+                  cache: "npm"
+            - run: npm ci
+            - run: npm run build
+            - run: npm run test
+
+    coverage:
         runs-on: ubuntu-latest
         strategy:
             fail-fast: false