Update workflow to detect changes in different directories

- Added new directory filters for detecting changes in 'tests' and 'playground' directories. Adjusted conditional statements based on the detected changes.

.github/workflows/main.yaml

@@ -13,36 +13,38 @@ jobs:
     permissions:
       pull-requests: read
     outputs:
-      src_changed: ${{ steps.src_changed.outputs.changes }}
+      src_changed: ${{ steps.src_changed.outputs.src }}
     steps:
 
       - name: checkout
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
-      - name: src - identify source changes
+      - name: tools - detect changes
         id: src_changed
         uses: dorny/paths-filter@v3
         with:
           base: ${{ github.ref }}
           filters: |
             src:
               - 'src/**'
-            solution:
               - 'ES.FX.sln'
-            build:
               - 'Directory.Build.props'
+            tests:
+              - 'tests/**'
+            playground:
+              - 'playground/**'
 
       - name: build 
+        if: steps.src_changed.outputs.changes == 'true'
         uses: ./.github/actions/build
-        if: steps.src_changed.outputs.src == 'true'
         with:
           configuration: Debug
           useVersioning: false
 
       - name: test 
-        if: steps.src_changed.outputs.src == 'true'
+        if: steps.src_changed.outputs.changes == 'true'
         uses: ./.github/actions/test
 
   cd: