feat(unity): IL2CPP line number limitations (#7629)

Co-authored-by: vivianyentran <20403606+vivianyentran@users.noreply.github.com>
Co-authored-by: Bruno Garcia <bruno@brunogarcia.com>

Author: 3 people

src/platforms/unity/configuration/il2cpp.mdx

@@ -25,3 +25,7 @@ options.Il2CppLineNumberSupportEnabled = false;
 ```
 
 The support for line numbers in C# Exceptions with IL2CPP relies on the debug symbol upload. With the automated debug symbol upload enabled, the [Sentry SDK will upload the line mapping automatically](/platforms/unity/native-support/#debug-symbols).
+
+### Known Limitations
+
+Currently, line number support is limited when programmatically subscribing to button click events via `Button.onClick.AddListener`. However, you can set up callbacks through the editor to work around this.