swift 6 fixes --enable-code-coverage

Author: swhitty

.github/workflows/build.yml

@@ -18,9 +18,9 @@ jobs:
       - name: Version
         run: swift --version
       - name: Build
-        run: swift test --enable-code-coverage --filter do_not_test
+        run: swift build --build-tests --enable-code-coverage
       - name: Test
-        run: swift test --enable-code-coverage --skip-build
+        run: swift test --skip-build --enable-code-coverage
       - name: Gather code coverage
         run: xcrun llvm-cov export -format="lcov" .build/debug/MutexPackageTests.xctest/Contents/MacOS/MutexPackageTests -instr-profile .build/debug/codecov/default.profdata > coverage_report.lcov
       - name: Upload Coverage