Utils: Use QStringView in FilePath implementations when it makes sense

Change-Id: I7346d873008f8ff1ab88f298a8d90e41f8c6d0b9
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Marcus Tillmanns <marcus.tillmanns@qt.io>
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/filepath.h

@@ -74,6 +74,7 @@ public:
 
     QStringView scheme() const;
     QStringView host() const;
+    QStringView pathView() const;
     QString path() const;
 
     void setParts(const QStringView scheme, const QStringView host, const QStringView path);