Utils: Move SearchResultItem/Color into Utils

It's going to be reused inside FileSearch.

Change-Id: I8993d7158ff31c311c2283d32bc43465a8946a52
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/git/gitgrep.h

@@ -5,9 +5,14 @@
 
 #include <texteditor/basefilefind.h>
 
-QT_FORWARD_DECLARE_CLASS(QCheckBox);
+QT_BEGIN_NAMESPACE
+class QCheckBox;
+QT_END_NAMESPACE
 
-namespace Utils { class FancyLineEdit; }
+namespace Utils {
+class FancyLineEdit;
+class SearchResultItem;
+}
 
 namespace Git::Internal {
 
@@ -28,7 +33,7 @@ public:
     QFuture<Utils::FileSearchResultList> executeSearch(
             const TextEditor::FileFindParameters &parameters,
             TextEditor::BaseFileFind *baseFileFind) override;
-    Core::IEditor *openEditor(const Core::SearchResultItem &item,
+    Core::IEditor *openEditor(const Utils::SearchResultItem &item,
                               const TextEditor::FileFindParameters &parameters) override;
 
 private: