Add Cypress custom command for creating the dashboard (#15004)

...ontend/test/metabase-enterprise/audit/auditing.cy.spec.js

frontend/test/__support__/commands.js

...est/metabase/scenarios/collections/collections.cy.spec.js

...t/metabase/scenarios/dashboard/chained-filters.cy.spec.js

...t/metabase/scenarios/dashboard/dashboard-drill.cy.spec.js

...nd/test/metabase/scenarios/dashboard/dashboard.cy.spec.js

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

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

...est/metabase/scenarios/dashboard/subscriptions.cy.spec.js

...end/test/metabase/scenarios/dashboard/text-box.cy.spec.js

frontend/test/metabase/scenarios/question/filter.cy.spec.js

frontend/test/metabase/scenarios/question/nested.cy.spec.js

frontend/test/metabase/scenarios/question/nulls.cy.spec.js

frontend/test/metabase/scenarios/question/view.cy.spec.js

...arios/visualizations/drillthroughs/chart_drill.cy.spec.js

...narios/visualizations/drillthroughs/dash_drill.cy.spec.js

...metabase/scenarios/visualizations/pivot_tables.cy.spec.js

frontend/test/snapshot-creators/default.cy.snap.js