(error-data): Delete functionscratch/error-API

Remove `error-data` from the new error API: it is not really
compatible with a more abstract view of error descriptors, and
in practice it seems to be used only in two ways (both of them rare):

- To add some contextual info to an error.  We should maybe add
  a dedicated support for that, but it's not clear what shape it
  should take, ideally (there was a discussion about with Alan
  and myself in emacs-devel a few years ago).
- To do some other massaging whose correctness is dubious anyway.

* doc/lispref/control.texi (Handling Errors): Remove `error-data`.

* lisp/epa-file.el (epa-file--find-file-not-found-function): Don't use
`error-data`.
(epa-file--error-add-context): New function, extracted from
`epa-file-insert-file-contents`.
(epa-file-insert-file-contents): Use it instead of `error-data`.

* lisp/subr.el (error-data): Delete function.

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