Migrate Avatar and AvatarStack test files from Jest to Vitest

[Copilot]

This PR migrates the test files for Avatar and AvatarStack components from Jest to Vitest as part of the ongoing testing framework migration.

Changes Made

Configuration Updates

• packages/react/vitest.config.browser.mts: Added Avatar and AvatarStack to the include patterns
• packages/react/jest.config.js: Added Avatar and AvatarStack to the modulePathIgnorePatterns to exclude them from Jest

Test File Migrations

Avatar.test.tsx

• ✅ Updated imports to use Vitest (describe, expect, it)
• ✅ Updated render imports to use @testing-library/react for DOM testing
• ✅ Maintained testRender from utils/testing for component prop testing
• ✅ Removed behavesAsComponent usage
• ✅ Removed checkExports usage
• ✅ Removed axe accessibility test with toHaveNoViolations
• ✅ Preserved all functional tests (size, src, margin props, style support)

AvatarStack.test.tsx

• ✅ Updated imports to use Vitest (describe, expect, it)
• ✅ Updated all render calls to use @testing-library/react
• ✅ Removed behavesAsComponent usage
• ✅ Removed checkExports usage
• ✅ Removed axe accessibility test with toHaveNoViolations
• ✅ Replaced snapshot test with specific assertion for alignRight behavior
• ✅ Fixed describe block name from "Avatar" to "AvatarStack"
• ✅ Preserved all tabindex and style prop tests

Code Quality

• All files pass prettier formatting
• All files pass eslint validation
• TypeScript compilation successful
• Minimal changes: 24 insertions, 52 deletions total

Test Coverage

All original test functionality is preserved while removing deprecated testing patterns. The components now run under Vitest instead of Jest, maintaining comprehensive coverage for:

• Component rendering and props
• DOM interactions and attributes
• Style and className support
• Accessibility features (tabindex behavior)

Fixes #6212.

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Latest commit: e3d68be

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