[refactor] rename stateDummy -> orphan_state
[refactor] rename stateDummy -> orphan_state

Summary:
Co-authored-by: Anthony Towns <aj@erisian.com.au>
                Suhas Daftuar <sdaftuar@gmail.com>

This is a partial backport of Core [[https://github.com/bitcoin/bitcoin/pull/15141 | PR15141]] : https://github.com/bitcoin/bitcoin/pull/15141/commits/00e11e61c0211a62788611cd6a6714a393fdc26c

Test Plan:
  ninja

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D6673

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