[Github Action] Setup codeception

[kingjia90]

Resolves https://github.com/pimcore/web-to-print-bundle/issues/3

Testing

• the creation and save of print document types (print page/container)
• saving the configs
• test each processor by generating a pdf with different orientation (landscape/portrait), asserted by page measurements getted from pdfinfo cli command
• asserting some part of the content of the pdf via pdfToText feature from Ghostscript

[aryaantony92]

Remove unused files https://github.com/pimcore/web-to-print-bundle/blob/deeac30ca69b5a1058552186a66e6ce15fdb7b80/.github/ci/files/config/packages/test/unittest.yaml and https://github.com/pimcore/web-to-print-bundle/blob/deeac30ca69b5a1058552186a66e6ce15fdb7b80/tests/Unit/_bootstrap.php