Make actions in the embedded debugger extensible

Now the embedded debugger defines its actions in `GtCoderEmbeddedDebuggerDetailsElement>>#initializeToolbarElement`. We can make it use the `globalDebuggingActionPragmas`  and `targetObjectDebuggingActionPragmas` to collect actions

<img width="1792" alt="Image" src="https://github.com/user-attachments/assets/263eaf35-3ce3-4a65-9791-0425e07494f5" />