Fix HTML5 one click button being active with templates missing #35680
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The editor would previously have the HTML5 one click deploy button is always visible if an HTML5 preset has been defined, even if the templates are missing or if it's misconfigured.
This disables the button in these cases and provides the error message output of can_export as the tooltip of the disabled button.
Fixes #35592.
This is my first attempt at a change on this project - if anything is wrong, apologies, please let me know.