[no-assign-mutated-array] doesn't account for flatMap

[Samuel-Therrien-Beslogic]

The rule will accept sorting a mapped array, but not a flatMapped one.
I suppose the rule checks for known function names, flatMap is common enough is should probably be excluded.

OK (but unicorn/prefer-array-flat-map)

const biggestQuantity = entityFilters
  .map(category => category.items.map(item => item.quantity))
  .flat(1)
  .sort((quantity1, quantity2) => quantity2 - quantity1)

OK (invalid code, just for linting demonstration purposes)

const biggestQuantity = entityFilters
  .map(category => category.items.map(item => item.quantity))
  .sort((quantity1, quantity2) => quantity2[0] - quantity1[0])

Fails no-assign-mutated-array

const biggestQuantity = entityFilters
  .flatMap(category => category.items.map(item => item.quantity))
  .sort((quantity1, quantity2) => quantity2 - quantity1)