Adding the integration callback url validation

Author: eduard13

app/code/Magento/Integration/Block/Adminhtml/Integration/Edit/Tab/Info.php

@@ -146,6 +146,7 @@ protected function _addGeneralFieldset($form, $integrationData)
                 'label' => __('Callback URL'),
                 'name' => self::DATA_ENDPOINT,
                 'disabled' => $disabled,
+                'class' => 'validate-url',
                 // @codingStandardsIgnoreStart
                 'note' => __(
                     'Enter URL where Oauth credentials can be sent when using Oauth for token exchange. We strongly recommend using https://.'