[GTK4] Update to new API for running javascript #2706
Merged
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The API for running javascript and integrating with javascript objects and types has changed substantially between GTK3 and GTK4 (technically between webkit2gtk 4 and webkitgtk 6)
The top level methods to call to run javascript changed:
With this Browser.execute works, so for example Snippet161 now works and the ControlExample shuts down cleanly.
Fixes #2667