Update long-run builds and add summary of scheduled diagnostics.

[akshaysridhar]

Follow up PR to #2349.
Uses the new stability dependent diffusion option introduced in PR2349 to the long-run pipeline. (Affects aquaplanet long-run cases)

Updates type_getters to summarize + print list of scheduled diagnostics.
Diagnostics summary : @Sbozzolo.

[szy21]

I only see changes in slab ocean now. Maybe something is wrong with the rebase?

[szy21]

Do you want to change the topography one as well?

[akshaysridhar]

Do you want to change the topography one as well?

We could do so, but I think I'd like to wait for the checks against the WIP implicit update branches and assign parameters accordingly.

[akshaysridhar]

Build logs from topography longruns (with WIP implicit solver update branch: https://buildkite.com/clima/climaatmos-longruns/builds/1354#018cf69d-e535-4a74-a729-e8e77a617526)

[szy21]

Could we merge this?

[akshaysridhar]

@Sbozzolo Added the diag print block you suggested in this PR type_getters.jl. If this is reasonable I can queue this to be merged soon.

[Sbozzolo]

@Sbozzolo Added the diag print block you suggested in this PR type_getters.jl. If this is reasonable I can queue this to be merged soon.

I made some minor improvements in 8282e98

At the end, it looks like this:

    length(diagnostics) > 0 && @info "Computing diagnostics:"

    for diag in diagnostics
        writer = nameof(typeof(diag.output_writer))
        @info "- $(diag.output_short_name) ($writer)"
    end

It would be great if you could add this instead. If you can keep it as a separate commit in this PR, that would be awesome.

(This change will be merged in with #2489 anyway)