Everywhere: Add sv suffix to strings relying on StringView(char const*)

Each of these strings would previously rely on StringView's char const*
constructor overload, which would call __builtin_strlen on the string.
Since we now have operator ""sv, we can replace these with much simpler
versions. This opens the door to being able to remove
StringView(char const*).

No functional changes.

Userland/Libraries/LibCodeComprehension/Cpp/Tests.cpp

@@ -33,7 +33,7 @@ static bool s_some_test_failed = false;
         return;                        \
     } while (0)
 
-constexpr char TESTS_ROOT_DIR[] = "/home/anon/Tests/cpp-tests/comprehension";
+constexpr auto TESTS_ROOT_DIR = "/home/anon/Tests/cpp-tests/comprehension"sv;
 
 class FileDB : public CodeComprehension::FileDB {
 public: