Drop the word name from image field input

This field is labeled as just "Image" in other places, so we want
it to match. Also, "name" can be confusing because users will think
they just need to provide the image name instead of the full image
location, which includes registry and tag version.

awx/ui_next/src/screens/ExecutionEnvironment/shared/ExecutionEnvironmentForm.jsx

@@ -95,7 +95,7 @@ function ExecutionEnvironmentFormFields({
       />
       <FormField
         id="execution-environment-image"
-        label={t`Image name`}
+        label={t`Image`}
         name="image"
         type="text"
         validate={required(null)}

awx/ui_next/src/screens/ExecutionEnvironment/shared/ExecutionEnvironmentForm.test.jsx

@@ -152,7 +152,7 @@ describe('<ExecutionEnvironmentForm/>', () => {
   });
 
   test('should display form fields properly', () => {
-    expect(wrapper.find('FormGroup[label="Image name"]').length).toBe(1);
+    expect(wrapper.find('FormGroup[label="Image"]').length).toBe(1);
     expect(wrapper.find('FormGroup[label="Description"]').length).toBe(1);
     expect(wrapper.find('CredentialLookup').length).toBe(1);
   });