Issue #3246055: Refactor ticket display page and PDF generation

commerce_ticketing.info.yml

src/CommerceTicketCreateTickets.php

src/EventSubscriber/OrderEventSubscriber.php

...ity_view_display.commerce_ticket.default.qr_only_test.yml

...ll/core.entity_view_mode.commerce_ticket.qr_only_test.yml

tests/src/Functional/TicketBrowserTestBase.php

tests/src/Kernel/QrCodeTest.php

tests/src/Kernel/TicketCreationTest.php

tests/src/Kernel/TicketKernelTestBase.php