Add gfs cycles to C48mx500_3DVarAOWCDA

[JessicaMeixner-NOAA]

What new functionality do you need?

To test more features, update gfs_cyc: 0 -> 4 in ci/cases/pr/C48mx500_3DVarAOWCDA.yaml

To do this we need more obs staged @guillaumevernieres

What are the requirements for the new functionality?

Test gfs forecast in 3DVarAOWCDA tests

Acceptance Criteria

Successful completion of C48mx500_3DVarAOWCDA on hera with gfs_cyc=4

Suggest a solution (optional)

No response