Draft: test: add feature spec for violation details

Relates to issue #579056

Changes

This MR adds a comprehensive frontend feature spec file for the Compliance Violation Details page at ee/spec/features/projects/security/compliance_violation_details_spec.rb.

Test Coverage Includes:

File Structure & Setup

• RSpec configuration with :js tag and feature_category: :compliance_management
• Complete test data setup using factories (group, user, project, framework, requirement, control, audit_event, violation)
• Proper user permissions and licensed feature stubbing

Page Navigation and Display

• Violation information display
• Violation title with proper format
• Project link display
• Audit event information

Status Management

• Changing violation status via dropdown with toast message verification

Comment Functionality

• Creating new comments
• Editing existing comments
• Displaying edited status on comments
• Deleting comments with modal confirmation
• Replying to comments

Comment Features

• Adding emoji reactions to comments

Related Sections

• Displaying related issues section
• Displaying activity section when comments exist

Feature Flag Behavior

• Testing feature flag disabled state

Implementation Details:

• 15 comprehensive test cases covering all major functionality
• Follows GitLab testing patterns based on existing specs like vulnerability_details_spec.rb
• Uses proper test helpers: wait_for_requests, within_testid, find_by_testid, sign_in, stub_licensed_features, stub_feature_flags
• Correct factory usage with proper associations
• Uses correct testid selectors from Vue components