Style enqueue correction for RTL languages

[vishalsingh098]

Trac ticket: https://core.trac.wordpress.org/ticket/61625

Changed line : wp_style_add_data( $style_handle_name, 'suffix', $suffix );

to:

wp_style_add_data( $style_handle_name, 'suffix', $is_core_block ? $suffix : '' );

Non-core blocks never use .min in their filenames, so storing a non-empty suffix caused WP_Styles::do_item() to search for ".min.css" in a URL that only has ".css", silently leaving the LTR URL unchanged on RTL sites.

[tests/phpunit/tests/blocks/register.php] — tests:

Added @ticket 61625 to the existing RTL test
Added a new dedicated test test_register_block_style_handle_rtl_suffix_is_empty_for_non_core_blocks that explicitly documents the requirement and will catch any regression

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