Disable related issues autocomplete

Closes https://gitlab.com/gitlab-org/gitlab/-/issues/296657

app/assets/javascripts/related_issues/components/related_issuable_input.vue

@@ -223,6 +223,7 @@ export default {
           type="text"
           class="js-add-issuable-form-input add-issuable-form-input"
           data-qa-selector="add_issue_field"
+          autocomplete="off"
           @input="onInput"
           @focus="onFocus"
           @blur="onBlur"

changelogs/unreleased/bugfix-linked-issue-autocomplete.yml

+---
+title: Improve Linked Issues Usability
+merge_request: 50879
+author: Andrew Minion
+type: changed