Issue Summary

This is reproducible on Data Center: Yes

Steps to Reproduce

1. Go to Jira server advanced settings and edit the project key pattern to be something not allowed in Jira Cloud e.g. ([A-Z0-9]+)
2. Create a project with a project key not allowed in the Cloud, for example, a project key contains '' like "TEST" 
3. Migrate the project to a cloud site using JCMA

Expected Results

The migration plan should throw a warning during pre-checks that the project key format is not allowed in the cloud.

Actual Results

The migration succeeds and doesn't throw any errors or warnings. This can cause issues in the Jira cloud due to inconsistencies in data integrity. 

Workaround

Change the project key to a supported format before or after the migration.