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.

Tests/LibRegex/RegexLibC.cpp

@@ -332,7 +332,7 @@ TEST_CASE(parser_error_special_characters_used_at_wrong_place)
 
         // After vertical line
         b.clear();
-        b.append("a|");
+        b.append("a|"sv);
         b.append(ch);
         pattern = b.build();
         EXPECT_EQ(regcomp(&regex, pattern.characters(), REG_EXTENDED), error_code_to_check);