If a theme/plugin raises an error while decorating post content, the decorator will be skipped, and the error reported on the console. Additionally, administrators will be shown a red warning at the top of the screen.
This commit refactors and re-uses some of the logic from the theme-initializer-error-reporting logic. In future, new error reports can be added by doing something like:
```
document.dispatchEvent(
new CustomEvent("discourse-error", {
detail: { messageKey: "some.translation.key", error },
})
);
```
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