fix: type verification for filter values

[Soare-Robert-Daniel]

Re-add the extra type verification for values that are computed with filters.

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• Have you followed the Optimole Contributing guideline?
• Does your code follow the WordPress' coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

Re-add some type verifications from 407e4fe

Closes #1002

How to test the changes in this Pull Request:

1. Add a custom filter for the WP hook 'wp_calculate_image_srcset' that returns a non-array value.
2. Check the logs for warnings

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?

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Pull Request Overview

This PR re-adds defensive type verification for filter values to prevent warnings when custom WordPress filters return unexpected types. The changes ensure that functions hooked to WordPress filters properly handle non-array return values from other filters.

• Added type guards to check if parameters are arrays before processing them
• Updated PHPDoc annotations to reflect that parameters can be mixed types
• Removed resolved PHPStan baseline entries for improved type specificity

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
inc/tag_replacer.php	Added array type check for $sources parameter in filter_srcset_attr method to handle non-array values from wp_calculate_image_srcset filter
inc/app_replacer.php	Added array type check for $resize parameter in get_optimized_image_url method to prevent errors when accessing array keys
inc/admin.php	Added array type check for $links parameter in add_action_links method to handle non-array values from plugin action links filter
phpstan-baseline.neon	Removed baseline entries for methods that now have proper type annotations with mixed types

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🎉 This PR is included in version 4.1.5 🎉

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