Fixed issue with macOS CI when overrides are being used. (#3270)

Fixed issue with macOS CI when overrides are being used.

### Motivation:

When we use Xcode_XX_X_build_arguments_override, the CI fails because of
an extra double quotes ("") making its way to the final command.

### Modifications:

Remove the extra double quote from the Yaml file defining macOS tests.

### Result:

We are able to run `swift build` with extra arguments.

Author: rafaelcepeda

.github/workflows/macos_tests.yml

@@ -295,15 +295,15 @@ jobs:
       - name: Swift build
         run: |
           if [ -n "${{ matrix.config.build_arguments_override }}" ]; then
-            swift build "${{ matrix.config.build_arguments_override }}"
+            swift build ${{ matrix.config.build_arguments_override }}
           else
             swift build --build-tests
           fi
       - name: Swift test
         if: 'inputs.swift_test_enabled'
         run: |
           if [ -n "${{ matrix.config.test_arguments_override }}" ]; then
-            swift test "${{ matrix.config.test_arguments_override }}"
+            swift test ${{ matrix.config.test_arguments_override }}
           else
             swift test
           fi