Media: avoid duplicate filenames for cropped sub-sizes

[ArkaPrabhaChowdhury]

Summary

• add explicit crop-aware filename suffixes when multiple generated image sizes share the same target dimensions
• keep normal sub-size filenames unchanged unless there is a duplicate-dimension collision risk
• add a regression test covering duplicate cropped sizes generated during attachment metadata creation

Trac ticket: https://core.trac.wordpress.org/ticket/62388

Testing

• php -l src/wp-admin/includes/image.php
• php -l src/wp-includes/class-wp-image-editor-gd.php
• php -l src/wp-includes/class-wp-image-editor-imagick.php
• php -l tests/phpunit/tests/media.php
• php vendor/bin/phpcbf src/wp-admin/includes/image.php src/wp-includes/class-wp-image-editor-gd.php src/wp-includes/class-wp-image-editor-imagick.php tests/phpunit/tests/media.php
• php vendor/bin/phpcs src/wp-admin/includes/image.php src/wp-includes/class-wp-image-editor-gd.php src/wp-includes/class-wp-image-editor-imagick.php tests/phpunit/tests/media.php
• php vendor/bin/phpunit tests/phpunit/tests/media.php --filter test_wp_generate_attachment_metadata_adds_unique_suffixes_for_duplicate_cropped_sizes (fails locally: test DB host mysql is unavailable in this session)

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[github-actions]

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[github-actions]

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