Implement the "deprecated" status marker from PEP 792 #18546
Description
PyPI has now implemented PEP 792, and includes support for three of the four standard status markers. The last one is deprecated, i.e. to signal that a package is considered obsolete and may have been superseded by another project.
I think implementing this will probably follow a pretty similar course as archived: it'll need to be added to LifecycleStatus, then exposed to project owners, and then propagated like the other statuses to the index.
Related subcomponents:
- Making sure we emit a proper security event for this status change