Fix generating RunTests.sh and RunTests.cmd scripts (#63875)

This fixes issue where generated RunTests.sh in the "To repro directly: "
section contained unevaluated variables like RUNTIME_PATH, which
prevented simple copy-pasting the code into the terminal

Author: rzikm

src/tasks/installer.tasks/GenerateRunScript.cs

@@ -121,8 +121,6 @@ private static string SanitizeEcho(string command, bool isUnix){
             // Escape backtick and question mark characters to avoid running commands instead of echo'ing them.
             string sanitizedRunCommand = command.Replace("`", "\\`")
                                                     .Replace("?", "\\")
-                                                    .Replace("$", "")
-                                                    .Replace("%", "")
                                                     .Replace("\r","")
                                                     .Replace("\n"," ")
                                                     .Replace("&", "^&")
@@ -138,4 +136,4 @@ private static string SanitizeEcho(string command, bool isUnix){
             return sanitizedRunCommand;
         }
     }
-}
+}