chore(sequenceEqual): convert sequenceEqual tests to run mode (#6318)

* chore(sequenceEqual): remove lodash assign from sequenceEqual tests

The _.assign operation was mutating global state which could lead to
some confusion when tests start to rely on the mutated state and the
order of execution.

* chore(sequenceEqual): rename comparor to comparator function in test description

* chore(sequenceEqual): convert sequenceEqual tests to run mode