Convert close and reopen operations to return a promise.

Review Request #11636 — Created May 28, 2021 and updated

david
Review Board
master
reviewboard

This change updates the review request close and reopen operations to
use promises instead of callbacks.

  • Ran js-tests.
  • Manually tested review request close and reopen.
Summary
Convert close and reopen operations to return a promise.
Checks run (2 succeeded)
flake8 passed.
JSHint passed.
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