VCS: Use more FilePath in ShellCommand and surroundings

Change-Id: Ie8c5fac09b45a54bcbe9a876044b653e7fccede5
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

src/plugins/coreplugin/vcsmanager.h

@@ -82,7 +82,7 @@ public:
     // added to revision control. Calls vcsAdd for each file.
     static void promptToAdd(const QString &directory, const QStringList &fileNames);
 
-    static void emitRepositoryChanged(const QString &repository);
+    static void emitRepositoryChanged(const Utils::FilePath &repository);
 
     // Utility messages for adding files
     static QString msgAddToVcsTitle();