fix(query-actions): reject with the actual error, not undefined

[gcutrini]

_fetch caught a failed getAccessToken and returned Promise.reject() with no error, so callers received undefined. Reject with the actual error so a caller can tell why the request failed.

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[gcutrini]

Superseded by #324: _fetch now reports a token failure only through the callback (return, no rejection), since the query* functions never await that promise and a rejection only surfaced as an unhandled rejection. Covered by the token-failure test there.