fix(core): Don't allow using credentials that are not part of the same project #9916
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Summary
It was possible to use the API directly to add credentials to a workflow that were not owned by the same project that the workflow was owned by.
This is not a security issue, because the user could not have added credentials they don't have access to. The workflow would just have failed to run.
Nonetheless, this is a bug that should be fixed.
Related Linear tickets, Github issues, and Community forum posts
https://linear.app/n8n/issue/PAY-1650/bug-n8n-is-allowing-users-to-save-workflows-with-credentials-not
Review / Merge checklist
Docs updated or follow-up ticket created.PR Labeled withrelease/backport
(if the PR is an urgent fix that needs to be backported)