Rework to store-r2d2 and add fetch_from_r2d2

[mranst]

Description

Reworks --skip-r2d2 to have the opposite behavior, now --store-r2d2 has to be set to enable registering and storing the experiment in r2d2.

Adds key that controls whether to fetch obs from r2d2. This replaces the default behavior of waiting for fail from GetObsNotInR2d2. This key is only implemented in atmos suites, for now.

[mranst]

fyi - this will of course require changing --skip-r2d2 to --skip-store-r2d2 in any existing scripts (-k is maintained)

[mer-a-o]

@mranst great addition! I think there are some inconsistencies for skip-store-r2d2 vs skip_store_r2d2 in this PR.
I tested swell create hofx_cf --skip-store-r2d2 and the experiment worked as expected. Also, 3dvar_atmos works correctly too.

[mranst]

@mranst great addition! I think there are some inconsistencies for skip-store-r2d2 vs skip_store_r2d2 in this PR. I tested swell create hofx_cf --skip-store-r2d2 and the experiment worked as expected. Also, 3dvar_atmos works correctly too.

Yeah, it's a discrepancy between POSIX-style formatting for command line flags --skip-store-r2d2 vs python syntax skip_store_r2d2

[Dooruk]

I don't have a chance to test this before I leave tomorrow but I'm wondering if we should have the skip_store defaulting True.

Tiered tests are filling up the swell project space until we figure out the scrubber.

[mranst]

I don't have a chance to test this before I leave tomorrow but I'm wondering if we should have the skip_store defaulting True.

Tiered tests are filling up the swell project space until we figure out the scrubber.

This is fine with me, I usually set false anyway

[mranst]

I've changed this so that instead of storing by default, now --store-r2d2 needs to be enabled. -k has been left in place with a deprecation warning.