[React Native] request cancel image upload (#14391)

* added hook blocks.onRemoveBlockCheckUpload called in componentWillUnmount to make sure to cancel upload if block is deleted

* removed unused import

* moving bridge-specific code to Image component - if the filter exists and returns true, the upload cancellation will be requested

* using hook actions instead of filters

packages/block-library/src/image/edit.native.js

@@ -34,6 +34,8 @@ import {
 } from '@wordpress/editor';
 import { __ } from '@wordpress/i18n';
 import { isURL } from '@wordpress/url';
+import { doAction, hasAction } from '@wordpress/hooks';
+
 
 /**
  * Internal dependencies
@@ -87,6 +89,10 @@ class ImageEdit extends React.Component {
 	}
 
 	componentWillUnmount() {
+		// this action will only exist if the user pressed the trash button on the block holder
+		if ( hasAction( 'blocks.onRemoveBlockCheckUpload' ) && this.state.isUploadInProgress ) {
+			doAction( 'blocks.onRemoveBlockCheckUpload', this.props.attributes.id )
+		}
 		this.removeMediaUploadListener();
 	}