chore: add migration script for inquiries without messages

Adding script to migrate all Inquiries documents previously created before recent move from single message to many messages.

Checklist

[X] I have ensured my pull request is not behind the main or master branch of the original repository.
[X] I have rebased all commits where necessary so that reviewing this pull request can be done without having to merge it first.
[X] I have written a commit message that passes commitlint linting.
[X] I have ensured that my code changes pass linting tests.
[X] I have ensured that my code changes pass unit tests.
[X] I have described my pull request and the reasons for code changes along with context if necessary.