Move internal Actions into .github/actions

This is a more standard location for these custom Actions.

.github/workflows/__swift-custom-build.yml

@@ -45,7 +45,7 @@ jobs:
       uses: actions/checkout@v3
     - name: Prepare test
       id: prepare-test
-      uses: ./.github/prepare-test
+      uses: ./.github/actions/prepare-test
       with:
         version: ${{ matrix.version }}
     - uses: ./../action/init
@@ -53,7 +53,7 @@ jobs:
       with:
         languages: swift
         tools: ${{ steps.prepare-test.outputs.tools-url }}
-    - uses: ./../action/.github/setup-swift
+    - uses: ./../action/.github/actions/setup-swift
       with:
         codeql-path: ${{steps.init.outputs.codeql-path}}
     - name: Check working directory