Organize Cypress tests in `scenarios` directory (#11848)

frontend/test/__support__/cypress.js

...nd/test/metabase/query_builder/simple-question.cy.spec.js

frontend/test/metabase/reference/guide.cy.spec.js

...nd/test/metabase/scenarios/admin/databases/add.cy.spec.js

...d/test/metabase/scenarios/admin/databases/edit.cy.spec.js

...d/test/metabase/scenarios/admin/databases/list.cy.spec.js

.../test/metabase/scenarios/admin/datamodel/field.cy.spec.js

...st/metabase/scenarios/admin/datamodel/segments.cy.spec.js

.../test/metabase/scenarios/admin/datamodel/table.cy.spec.js

...nd/test/metabase/scenarios/admin/people/people.cy.spec.js

...tabase/scenarios/admin/permissions/permissions.cy.spec.js

...est/metabase/scenarios/admin/settings/settings.cy.spec.js

frontend/test/metabase/scenarios/auth/signin.cy.spec.js

frontend/test/metabase/scenarios/custom_question.cy.spec.js

frontend/test/metabase/scenarios/dashboard/embed.cy.spec.js

...tabase/scenarios/dashboard/parameters-embedded.cy.spec.js

...d/test/metabase/scenarios/dashboard/parameters.cy.spec.js

frontend/test/metabase/scenarios/data_ref_sidebar.cy.spec.js

frontend/test/metabase/scenarios/home/overworld.cy.spec.js

frontend/test/metabase/scenarios/permissions.cy.spec.js