Standardize logging locations across desktop platforms (#6238)

* Standardize logging locations across desktop platforms

* Return null instead of empty literal on exceptions

* Remove LogDirectoryPath from LoggerModule

* Catch exception when creating DirectoryInfo in FileLogTarget

* Remove redundant log path vars, handle exception better, add null check

* Address styling issues

* Remove extra newline, quote file path in log, move directory check to OpenHelper

* Add GetOrCreateLogsDir to get/create log directory during runtime

* misc format changes

* Update src/Ryujinx.Common/Configuration/AppDataManager.cs

---------

Co-authored-by: jcm <butt@butts.com>
Co-authored-by: TSR Berry <20988865+TSRBerry@users.noreply.github.com>
Co-authored-by: Ac_K <Acoustik666@gmail.com>

src/Ryujinx.Common/Logging/Targets/FileLogTarget.cs

@@ -23,7 +23,18 @@ namespace Ryujinx.Common.Logging.Targets
         public static FileStream PrepareLogFile(string path)
         {
             // Ensure directory is present
-            DirectoryInfo logDir = new(path);
+            DirectoryInfo logDir;
+            try
+            {
+                logDir = new DirectoryInfo(path);
+            }
+            catch (ArgumentException exception)
+            {
+                Logger.Warning?.Print(LogClass.Application, $"Logging directory path ('{path}') was invalid: {exception}");
+
+                return null;
+            }
+
             try
             {
                 logDir.Create();