Use global.json dotnet version for actions (#3722)

Author: hazzik

.github/workflows/GenerateAsyncCode.yml

@@ -21,7 +21,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v5
       with:
-        dotnet-version: 8.0.x
+        global-json-file: global.json
 
     - name: Generate Async code
       run: |

.github/workflows/NetCoreTests.yml

@@ -63,16 +63,16 @@ jobs:
     - name: Set up ${{matrix.DB}}
       run: ${{matrix.DB_INIT}}
 
-    - name: Set up .NET
-      uses: actions/setup-dotnet@v5
-      with:
-        dotnet-version: 8.0.x
-
     - name: Checkout
       uses: actions/checkout@v5
       with:
         show-progress: false
 
+    - name: Set up .NET
+      uses: actions/setup-dotnet@v5
+      with:
+        global-json-file: global.json
+
     - name: Build and Test
       run: |
         pwsh -noprofile -command "& ./build.ps1 -TaskList Set-Configuration,Test -properties @{'Database' = '${{matrix.DB}}';'ConnectionString'='${{matrix.CONNECTION_STRING}}'}"