Added uploadUrl props to React component (#15208)

no issue
- passes `uploadUrl` to React component as a prop.

ghost/admin/app/components/gh-koenig-editor-react.hbs

@@ -39,6 +39,7 @@
             @mobiledoc={{@body}}
             @didCreateEditor={{this.onEditorCreated}}
             @onChange={{@onBodyChange}}
+            @uploadUrl={{this.uploadUrl}}
         />
 
         {{!-- <KoenigEditor

ghost/admin/app/components/gh-koenig-editor-react.js

@@ -1,4 +1,5 @@
 import Component from '@glimmer/component';
+import ghostPaths from 'ghost-admin/utils/ghost-paths';
 import {action} from '@ember/object';
 import {tracked} from '@glimmer/tracking';
 
@@ -7,6 +8,7 @@ export default class GhKoenigEditorReactComponent extends Component {
     titleElement = null;
     koenigEditor = null;
     mousedownY = 0;
+    uploadUrl = `${ghostPaths().apiRoot}/images/upload/`;
 
     @tracked titleIsHovered = false;
     @tracked titleIsFocused = false;

ghost/admin/app/components/koenig-react-editor.js

@@ -87,6 +87,7 @@ export default class KoenigReactEditor extends Component {
                             mobiledoc={this.args.mobiledoc}
                             didCreateEditor={this.args.didCreateEditor}
                             onChange={this.args.onChange}
+                            uploadUrl={this.args.uploadUrl}
                         />
                     </Suspense>
                 </ErrorHandler>