Handle SameSiteCookie check for index.php in AppFramework Middleware

lib/base.php

lib/composer/composer/autoload_classmap.php

lib/composer/composer/autoload_static.php

lib/private/AppFramework/DependencyInjection/DIContainer.php

lib/private/AppFramework/Http/Request.php

.../Security/Exceptions/LaxSameSiteCookieFailedException.php

...ramework/Middleware/Security/SameSiteCookieMiddleware.php

tests/lib/AppFramework/Http/RequestTest.php

...work/Middleware/Security/SameSiteCookieMiddlewareTest.php