DM-13163: Refactor ap_pipe to use CmdLineTask primitives

[kfindeisen]

This PR registers dataset mappings for configs and metadata persisted by ApPipeTask.

[r-owen]

Why is this needed? It seems to match the entries in obs_base (other than indentation). I would have thought it could be omitted.

[kfindeisen]

I was using processCcd_config and processCcd_metadata as templates; since they use full definitions, I assumed that for some reason they can't see what's in obs_base.

[kfindeisen]

(Note that due to pipeline limitations, obs_decam is the only one I'm in any position to test at the moment.)

[r-owen]

If obs_x can't see the defaults in obs_base then something is seriously wrong. I suggest not making these changes until you have strong evidence they are needed. You could put them on a private branch if you want to save them.

[kfindeisen]

No, they're pretty easy to reproduce. Should the obs packages that still use PAF instead of YAML files also be able to see the obs_base defaults?

[r-owen]

I believe obs packages that use .paf files do still use the configuration in obs_base, but I suggest asking on the DM room for details. In particular I don't know if it is allowed to just specify fields you wish to override in the .paf file.