Allow WAL rollback to handle partial failure when creating API keys

[austingebauer]

Overview

The WAL entry that allows the plugin to eventually clean up from partial failure was being immediately deleted. Instead, we should allow the WAL rollback function to eventually clean up from the partial failure.

Fixes https://github.com/hashicorp/vault-plugin-secrets-mongodbatlas/issues/27.

Related Issues/Pull Requests

• https://github.com/hashicorp/vault-plugin-secrets-mongodbatlas/issues/27

Contributor Checklist

• [ ] No documentation required
• [x] Backwards compatible