fix: fix typos in the exceptions for limits

[mfocko]

After switching our deployment to MP+ we (read as “me”) missed some occurences of hardcoded project/namespace for Packit Service deployment.

• Fix those typos.
• Add warning to the template.

[softwarefactory-project-zuul[bot]]

Build failed. https://softwarefactory-project.io/zuul/t/packit-service/buildset/023d3322c74143e694c91d697a36ccc5

:heavy_check_mark: pre-commit SUCCESS in 1m 56s :x: deployment-tests RETRY_LIMIT in 7m 51s