[ruby/psych] Fix usage of rb_struct_initialize() to pass an Array of members values and not a Hash

* rb_struct_initialize() does not accept a Hash, and it's very brittle
  to pass `[{...}]` and to rely on that C function using rb_keyword_given_p().
  It basically worked accidentally, by having **members in the caller of the caller.
  Such logic when Struct#initialize is defined in Ruby (as in TruffleRuby) is basically impossible to implement,
  because it's incorrectly treating positional arguments as keyword arguments.
* rb_struct_initialize() is used in CRuby to set members of Data instances in marshal.c (there is no rb_data_initialize() yet).
  There, the code passes an Array of members values for Data (and for Struct which are not `keyword_init: true`):
  https://github.com/ruby/ruby/blob/48c7f349f68846e10d60ae77ad299a38ee014479/marshal.c#L2150-L2176
  So we should do the same in psych.
* Rename to init_data since it's only used for Data.
* See https://github.com/ruby/psych/pull/692#discussion_r2483947279.

https://github.com/ruby/psych/commit/3550148378

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