[api] get rid of "removed" operation state for binary tracking

the obsolete tag is enough and we do not want to override existing data
in operation element
[api] check for patchinfos by type, not name
[api] lookup update projects for channel package search
[api][webui] make maintained projects a model

This fixes some database issues. Brought to you from OhgottOhgottOhgott-Releases....