update path to global ctest model data

[RussTreadon-NOAA]

Description
NCO requires model_data be replaced by model in COM paths. This PR updates the paths to input data for global GSI ctests to conform with this standard.

Resolves #761

Type of change

• Maintenance

How Has This Been Tested?
Run global ctests on Dogwood, Hera, and Hercules

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• New and existing tests pass with my changes

[RussTreadon-NOAA]

@KateFriedman-NOAA , if you have time your review and approval of the changes in this PR would be appreciated. This PR addresses the GSI portion of g-w issue #2886

[KateFriedman-NOAA]

Looks good, thanks @RussTreadon-NOAA !

[RussTreadon-NOAA]

Thank you @KateFriedman-NOAA for reviewing the changes and approving. GSI global ctests are currently running on Dogwood, Hercules and Hera. I'll fire off an Orion test after the Hercules test finishes. The PR will be scheduled for merger into develop upon successful completion of multi-platform global ctests.

[RussTreadon-NOAA]

Oops, I forgot that we do not yet have an Orion Rocky 9 GSI build. GSI issue #754 was opened to document this task. Issue #754 remains open. Since the Hercules and Orion global GSI ctests pull data from the same directory, it is sufficient for this PR to run the test only on Hercules.

[RussTreadon-NOAA]

Hercules global ctest

Test project /work2/noaa/da/rtreadon/git/gsi/model/build
    Start 1: global_4denvar
1/2 Test #1: global_4denvar ...................   Passed  1783.24 sec
    Start 7: global_enkf
2/2 Test #7: global_enkf ......................   Passed  1985.71 sec

100% tests passed, 0 tests failed out of 2

Total Test time (real) = 3769.97 sec

Confirm from run directories that background files link to model case directories.

[RussTreadon-NOAA]

Hera global ctest

Test project /scratch1/NCEPDEV/da/Russ.Treadon/git/gsi/model/build
    Start 1: global_4denvar
1/2 Test #1: global_4denvar ...................   Passed  1986.35 sec
    Start 7: global_enkf
2/2 Test #7: global_enkf ......................   Passed  755.20 sec

100% tests passed, 0 tests failed out of 2

Total Test time (real) = 2741.57 sec

Check run directories to confirm that background files are linked to model case directories.

[RussTreadon-NOAA]

WCOSS2 (Dogwood) global ctest

Test project /lfs/h2/emc/da/noscrub/russ.treadon/git/gsi/model/build
    Start 1: global_4denvar
1/2 Test #1: global_4denvar ...................   Passed  4444.54 sec
    Start 7: global_enkf
2/2 Test #7: global_enkf ......................   Passed  1212.33 sec

100% tests passed, 0 tests failed out of 2

Total Test time (real) = 5656.98 sec

Check run directories to confirm that background files are linked to model case directories.