[release/6.0.4xx] class-parse/generator response file space fix (#7106)

Context: #5926
Fixes: dotnet/maui#8049

There was a bug causing response files to not work when trying to bind
Java libraries in a path containing a space, since the CLI argument
given to `class-parse`/`generator` was not properly quoted.

This has been fixed in 67ce902, however this is
a .NET 7 only PR.

Pull the fix out of that PR and port it to the `6.0.4xx` branch so it
will go into a .NET 6 servicing release.

src/Xamarin.Android.Build.Tasks/Tasks/ClassParse.cs

@@ -38,7 +38,7 @@ protected override string GenerateCommandLineCommands ()
 					WriteLine (sw, $"\"{doc}\"");
 			}
 
-			cmd.AppendSwitch ($"@{responseFile}");
+			cmd.AppendSwitch ($"\"@{responseFile}\"");
 
 			return cmd.ToString ();
 		}

src/Xamarin.Android.Build.Tasks/Tasks/Generator.cs

@@ -236,8 +236,8 @@ protected override string GenerateCommandLineCommands ()
 					WriteLine (sw, "--use-legacy-java-resolver=true");
 			}
 
-			cmd.AppendSwitch (ApiXmlInput);
-			cmd.AppendSwitch ($"@{responseFile}");
+			cmd.AppendSwitch ($"\"{ApiXmlInput}\"");
+			cmd.AppendSwitch ($"\"@{responseFile}\"");
 			return cmd.ToString ();
 		}