Do not use ruby2_keywords for ... argument forwarding

This allows ... argument forwarding to benefit from Allocationless
Anonymous Splat Forwarding, allowing the `f` call below to not
allocate an array or a hash.

```ruby
a = [1]
kw = {b: 2}

def c(a, b:)
end

def f(...)
  c(...)
end

f(*a, **kw)
```

This temporarily skips prism locals tests until prism is changed
to use * and ** for ..., instead of using ruby2_keywords.

Ignore failures in rbs bundled gems tests, since they fail due
to this change.

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