V17 - Removed obsoleted code from Umbraco.Extension (#19937)

* Removing obsoleted class GlobalSettingsExtensions.cs

* Removing obsoleted methods and usage from ObjectExtensions.cs

* Removing a ton of obsoleted methods from PublishedContentExtensions.cs

* Removing obsoleted constructors

* Removing obsoleted tag on private method that's still in use.

Author: NillasKA

src/Umbraco.Core/Configuration/GlobalSettingsExtensions.cs

@@ -351,7 +351,6 @@ public static Attempt<T> TryConvertTo<T>(this object? input)
         return Attempt<object?>.Fail();
     }
 
-    [Obsolete("This method is no longer used in Umbraco. The method will be removed in Umbraco 17.")]
     /// <summary>
     /// Attempts to convert the input string to the output type.
     /// </summary>