[commRustModule] expose deletePasswordUser to JS

Summary:
make the rust identity client method from the previous diff callable from JS

Depends on D11588

Test Plan: called the client method for a password user and confirmed that the user was deleted in my localstack ddb

Reviewers: kamil, bartek

Reviewed By: bartek

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D11589