Mark Style/IdenticalConditionalBranches as unsafe auto-correction

[koic]

Follow up to #9982 (comment)

This PR marks Style/IdenticalConditionalBranches as unsafe auto-correction.

Style/IdenticalConditionalBranches cop is marked unsafe auto-correction as the order of method calls must be guaranteed in the following case:

if method_that_modifies_global_state # 1
  method_that_relies_on_global_state # 2
  foo                                # 3
else
  method_that_relies_on_global_state # 2
  bar                                # 3
end

In such a case, auto-correction may change the invocation order.

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