chore!: remove migrations from 5.x (#33619)

apps/meteor/server/startup/migrations/index.ts

apps/meteor/server/startup/migrations/minimumVersion.ts

apps/meteor/server/startup/migrations/v266.ts

apps/meteor/server/startup/migrations/v267.ts

apps/meteor/server/startup/migrations/v268.ts

apps/meteor/server/startup/migrations/v269.ts

apps/meteor/server/startup/migrations/v270.ts

apps/meteor/server/startup/migrations/v271.ts

apps/meteor/server/startup/migrations/v272.ts

apps/meteor/server/startup/migrations/v273.ts

apps/meteor/server/startup/migrations/v274.ts

apps/meteor/server/startup/migrations/v275.ts

apps/meteor/server/startup/migrations/v276.ts

apps/meteor/server/startup/migrations/v277.ts

apps/meteor/server/startup/migrations/v278.ts

apps/meteor/server/startup/migrations/v279.ts

apps/meteor/server/startup/migrations/v280.ts

apps/meteor/server/startup/migrations/v281.ts

apps/meteor/server/startup/migrations/v282.ts

apps/meteor/server/startup/migrations/v283.ts