* Adds image URL validation to image URLs in configs_controller.rb
* Adds additional image URLs to #valid_image_url in configs_controller.rb
* Adds tests around valid image URLs to configs_spec.rb
* WIP: sets strict conditions for before_action
* WIP: comments out unused code for draft PR
* WIP: cleans up configs_controller.rb for draft PR review
* Renames constant to more explicit IMAGE_FIELDS in configs_controller.rb
* Removes unnecessary comments from admin/configs_spec.rb
* Checks for matching keys in params and IMAGE_FIELDS in configs_controller
* Refactors #valid_image_urls and #valid_image_url in ConfigsController (THANK U, ANDY)
* Refactors image-related code and error messages in Admin::ConfigsController
* Renames expected_image_url to invalid_image_url and removes useless test
* Fix: update the tests to contain valid image urls so that they pass the validation.
* Adjusts tests & VALID_URL regex to validate images rather than image-specific URL
* Replaces $ with \z per Rhymes suggestion and feedback
* Adds accidentally removed code
Co-authored-by: Ridhwana <ridhwana.khan16@gmail.com>
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