Swift: move diagnostics definition to the source file

swift/xcode-autobuilder/XcodeBuildRunner.cpp

@@ -5,7 +5,17 @@
 #include <spawn.h>
 #include "absl/strings/str_join.h"
 
-#include "swift/xcode-autobuilder/XcodeBuildLogging.h"
+#include "swift/logging/SwiftLogging.h"
+
+namespace codeql_diagnostics {
+constexpr codeql::SwiftDiagnosticsSource build_command_failed{
+    "build_command_failed",
+    "Detected build command failed",
+    "Set up a manual build command",
+    "https://docs.github.com/en/enterprise-server/code-security/code-scanning/"
+    "automatically-scanning-your-code-for-vulnerabilities-and-errors/customizing-code-scanning",
+};
+}
 
 static codeql::Logger& logger() {
   static codeql::Logger ret{"build"};