Added fallback for media thumbnail retrieval

[girishpanchal30]

Summary

Added a fallback to retrieve media from the thumbnail tag for the RSS feed.

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• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
• I have assigned a reviewer or two to review this PR

Closes https://github.com/Codeinwp/feedzy-rss-feeds-pro/issues/957

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Pull request overview

Adds a fallback image extraction path in feedzy_retrieve_image() to support feeds that expose thumbnails via a media:thumbnail tag (MRSS), improving thumbnail detection when enclosures/itunes/content images aren’t present.

Changes:

• Add media:thumbnail lookup (http://search.yahoo.com/mrss/) as an additional thumbnail source in feedzy_retrieve_image().
• Prefer the newly found thumbnail before falling back to content/description parsing.

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This change adds a new image-source fallback (media:thumbnail), but the existing PHPUnit coverage for feedzy_retrieve_image() (see tests/test-admin-abstract.php) doesn’t include a case for media:thumbnail. Please add a test feed item containing a media:thumbnail element so the new behavior is verified and protected against regressions.

Suggested change

	if ( isset( $data['0']['data'] ) && ! empty( $data['0']['data'] ) ) {
	$the_thumbnail = $data['0']['data'];
	if ( ! empty( $data['0']['data'] ) ) {
	$the_thumbnail = $data['0']['data'];
	} elseif ( ! empty( $data['0']['attribs']['']['url'] ) ) {
	$the_thumbnail = $data['0']['attribs']['']['url'];
	} elseif ( ! empty( $data['0']['attribs']['']['href'] ) ) {
	$the_thumbnail = $data['0']['attribs']['']['href'];