Address vue/no-unused-properties violations in app/assets/javascripts/vue_merge_request_widget/

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**I have grouped the files into sections, each with its own MR. The first section states/*. **

Scope: states/* Components This MR focuses on cleaning up unused props and methods as flagged by the vue/no-unused-properties ESLint rule, specifically under the vue_merge_request_widget/states/ directory. Each file was individually reviewed and updated where applicable.

Summary of Changes

1. mr_widget_merge_archived.vue

• Retained name: MRWidgetArchived for global registration/use.
• Removed unused prop: mr.
• Cleaned up propsData in mr_widget_archived_spec.js.

2. mr_widget_merge_enabled.vue

• No unused props or methods found.
• Test file (mr_widget_auto_enabled_spec.js) uses propsData effectively.

3. mr_widget_auto_merge_failed.vue

• Prop mr not directly used in component or methods.
• However, it's referenced in test setup — left untouched to avoid breaking implicit usage.

4. mr_widget_checking.vue

• Removed unused prop: mr.
• Cleaned up test (mr_widget_checking_spec.js) by removing redundant propsData.

5. mr_widget_merged.vue

• All props and methods are actively used.
• propsData confirmed in tests (mr_widget_merged_spec.js).
• Component imported in show.rb — no changes made.

6. mr_widget_missing_branch.vue

• No unused props or methods.
• propsData verified in mr_widget_missing_branch_spec.js.

✅ Test Results

• All relevant states/* specs pass locally.
• Non-related test failure observed (getJobArtifactsResponse fixture missing) — unrelated to this MR scope.

✅ Next Steps Moving on to clean up other components in this directory.

Please let me know if anything was missed — happy to review or revise accordingly. Thanks!

Re #525778 (closed)