`no-array-reduce` - doesn't report optional chaining

[ipanasenko]

Title is pretty self-explanatory. no-array-reduce doesn't report optional chaining calls of reduce, e.g. array?.reduce()

Rule: no-array-reduce

array.reduce((str, item) => str += item, "") // reports correctly as error
array?.reduce((str, item) => str += item, "") // doesn't report this one

I see in rule's code optionalMember: false is explicitly passed. So, is this really a bug or an intended behaviour?
I've created a PR with new test cases - they fail: #2721

Thanks!

[fisker]

We can remove that limitation.

[ipanasenko]

All mutating methods rules also don't check optional chaining, did I get that right? E.g. no-array-sort

[ipanasenko]

Enabled reporting of optionally chained and called .reduce() in #2721