Add the [Enter] shortcut to the modal window for entering duplicates issue
## Issue On the issue management page, you can mark an issue as a duplicate. In this case, a modal window for entering a URL will appear. Pressing <kbd>Enter</kbd> in it does nothing. | 1 | 2 | | ------ | ------ | | ![image](/uploads/13f1b63a926c8b014bafd31504918e61/image.png) | ![image](/uploads/aa4f62818d44e80fa09428b5b4d6d926/image.png) | The window should accept the entered URL when <kbd>Enter</kbd> is pressed in the input field. ## Implementation plan Changes will mostly be needed in `app/javascript/pages/manage-issue-page/CloseDuplicateModal.vue` and probably `app/javascript/pages/manage-issue-page/CloseDuplicateModal.spec.js` 1. Remove the default footer from the modal (using the `no-footer` prop like we do in `app/javascript/pages/user-page/AddPointsModal.vue`) 2. Add a BForm wrapper around the form (handling the `@submit` event) 3. Add a BButton submit button 4. Update tests Alternatively, we COULD consider adding some kind of listener for enter key, but I don't think that's the right way to go about it. BONUS: We could also research whether anyone has already implemented a solution for bootstrap-vue-next and/or is there an open issue in their issue tracker? --- /cc @gitlab-org/developer-relations/contributor-success
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