AK+LibRegex: Disable construction of views from temporary Strings

Author: https://github.com/IdanHo
Commit: e8f6840471
Pull-request: https://github.com/SerenityOS/serenity/pull/9812

AK/StringView.h

@@ -48,6 +48,8 @@ public:
     StringView(const String&);
     StringView(const FlyString&);
 
+    explicit StringView(String&&) = delete;
+
     [[nodiscard]] constexpr bool is_null() const { return !m_characters; }
     [[nodiscard]] constexpr bool is_empty() const { return m_length == 0; }