Respond with PreconditionFailed when If-Match header invalid

[jisantuc]

Related Issue(s): #

none

Proposed Changes:

1. Respond with as specific a response as possible when we know what went wrong with an item update in api transactions extension PUT. BadRequest and NotFound don't tell the user that they should refresh the object and try again, while a PreconditionFailed for a request with an If-Match header is extremely clear

PR Checklist:

• This PR has no breaking changes.
• I have added my changes to the CHANGELOG or a CHANGELOG entry is not required.
• API only: I have run npm run generate-all to update the generated OpenAPI files.

[cholmes]

Thanks for the contribution! Will be in 0.9.0-RC2, as discussed in the call, since it is a minor improvement and we're going to do the rc2 regardless.