The PaginatedListedOriginList model has been updated in
rDSCHb93aa5be2c2d5dc2130e1027698f3e1255052d8d and the origins
field has been renamed to results.
The lister is stateless and has full listing capability.
It can request the Gitea API using HTTP token authentication.
Rate-limiting was not encountered but is handled generically.
Added support for getting repo last update date through API.
The gitea lister can be run on multiple instances which could use the same id.
So listing another gitea instance, the current code would fail to insert data
for such case.
This commit fixes that behavior by prefixing the uid with the instance name.
Related to T2577
Prior to this commit, all listers were instantiated at the same time even if
only one was needed. This commit separates those instantiations.
The only drawback to this is the db model initialization which now happens at
each lister instantiation. This can be dealt with if needed at another time
though.
