Related issues input should accept an issue ID without the pound sign prefix
### Summary The related issue input box should accept an issue ID regardless if it is prefixed by a `#` or not: ![image](/uploads/3328ceec7f907fb07f3070dff133a6b7/image.png) The placeholder text in the input hints that the `#` is required, but I still intuitively paste a bare issue ID every time I interact with this control. In addition, perhaps the placeholder text should read `#<issue id>` instead of `<#issue id>` - this would make it a bit more clear that the `#` is required.
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