[DA-269] Fix deadlock when inserting QR and updating participant simultaneously. (#373)
[DA-269] Fix deadlock when inserting QR and updating participant simultaneously. (#373)

* Eliminating deadlock when updating participant and questionnaire response simultaneously.

* Automatically removed trailing whitespace.

* Updating comment.

* Delint

* Automatically removed trailing whitespace.

all-of-us/raw-data-repository,all-of-us/raw-data-repository,all-of-us/raw-data-repository