Generate test application automatically

[maximehuran]

Doctrine 3 conflict

• Temporary add "doctrine/dbal": "^3" while Sylius/Sylius#13215 is not released.
• I modified the Recipe Github action in order to install all dependencies after require our plugin. This will load our defined conflict, and Sylius will be installed with doctrine/dbal 2.x instead of 3.x

Use Makefile to generate test application

• Add application target wich will initialize a test application from sylius-standard
• Add dist folder with some file to copy in our test application
• Ignore totally tests/Application folder in git
• Ignore totally tests/Application folder in PHPCS
• Use custom folder for PHPUnit tests, in order to avoid all unit tests in tests/Application/vendor !

[maximehuran]

Flex Recipe / recipe (7.4, ~1.9.0) (pull_request) Failing after 1m — recipe (7.4, ~1.9.0) 
Flex Recipe / recipe (7.4, ~1.10.0) (pull_request) Failing after 1m — recipe (7.4, ~1.10.0)
Flex Recipe / recipe (8.0, ~1.10.0) (pull_request) Failing after 1m — recipe (8.0, ~1.10.0) 

Will not work while Sylius does not release the Doctrine 3 conflict https://github.com/Sylius/Sylius/pull/13215

EDIT : I updated the recipe action to not install anything before set all my requirements, and with the doctrine conflicts added in our plugin, this one we be taken in consideration during composer install.