Support image filtering by alias in ImageV2 GQL API

Enable GraphQL clients to filter images by alias name in the ImageV2 API.

## Background

Currently, ImageV2FilterGQL supports filtering by:

- status (ALIVE, DELETED)

- name (canonical image name)

- architecture (x86_64, aarch64)

However, users cannot filter images by their alias names (e.g., "python", "tensorflow").

## Proposed Solution

Add alias filter support using subquery-based filtering:

- Filter images by alias name (contains, equals, startsWith, endsWith)

- Use IN subquery to avoid JOIN complexity

- No ordering support (aliases can have multiple values)

## Implementation Scope

1. Repository layer: Add alias filter conditions to ImageConditions

2. API/GQL layer: Add alias field to ImageV2FilterGQL

JIRA Issue: BA-4817