feature #13163 [UX][Attribute] Use single_text widget for Date&DateTi…

…me attribute form type (Jibbarth)

This PR was merged into the 1.12 branch.

Discussion
----------

| Q               | A
| --------------- | -----
| Branch?         | master <!-- see the comment below -->
| Bug fix?        | no
| New feature?    | yes
| BC breaks?      | no
| Deprecations?   | no
| Related tickets | N/A
| License         | MIT

Hi 👋 

I notice that Date and DateTime attribute use the default render on Product attribute tabs:

![image](https://user-images.githubusercontent.com/3168281/135748246-9c4577fd-5b8f-4604-a729-67498a580612.png)

This PR change this to use the great  rendering, combined with : 

![image](https://user-images.githubusercontent.com/3168281/135748309-c67d66ea-9ca1-4469-89d8-f3e710dad88c.png)

I think it would provide a better User Experience to have unified display for date/datetime in the Admin.

I targetted  branch cause it could be considered as a new feature, but I can change to  if needed.

WDYT ?  


Commits
-------

93018e1 [UX][Attribute] Use single_text widget for Date and DateTime attribute Form type

src/Sylius/Bundle/AttributeBundle/Form/Type/AttributeType/DateAttributeType.php

@@ -29,6 +29,7 @@ public function configureOptions(OptionsResolver $resolver): void
         $resolver
             ->setDefaults([
                 'label' => false,
+                'widget' => 'single_text',
             ])
             ->setRequired('configuration')
             ->setDefined('locale_code')

src/Sylius/Bundle/AttributeBundle/Form/Type/AttributeType/DatetimeAttributeType.php

@@ -29,6 +29,8 @@ public function configureOptions(OptionsResolver $resolver): void
         $resolver
             ->setDefaults([
                 'label' => false,
+                'date_widget' => 'single_text',
+                'time_widget' => 'single_text',
             ])
             ->setRequired('configuration')
             ->setDefined('locale_code')