Media: support strict stream-wrapper directory stats

[ArkaPrabhaChowdhury]

Summary

• preserve trailing slashes for stream-wrapper directories before inheriting file permissions
• use the helper in upload handling and both image editor implementations
• add strict stream-wrapper regression coverage for uploads plus nested GD and Imagick saves

Trac ticket: https://core.trac.wordpress.org/ticket/42838

Testing

• php vendor/bin/phpcbf --standard=phpcs.xml.dist src/wp-includes/functions.php src/wp-admin/includes/file.php src/wp-includes/class-wp-image-editor-gd.php src/wp-includes/class-wp-image-editor-imagick.php tests/phpunit/includes/class-wp-test-strict-dir-stream.php tests/phpunit/tests/upload.php tests/phpunit/tests/image/editorGd.php tests/phpunit/tests/image/editorImagick.php
• php vendor/bin/phpcs --standard=phpcs.xml.dist src/wp-includes/functions.php src/wp-admin/includes/file.php src/wp-includes/class-wp-image-editor-gd.php src/wp-includes/class-wp-image-editor-imagick.php tests/phpunit/includes/class-wp-test-strict-dir-stream.php tests/phpunit/tests/upload.php tests/phpunit/tests/image/editorGd.php tests/phpunit/tests/image/editorImagick.php

[github-actions]

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[github-actions]

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