add tostring(pkgVersion) to select GDAS modulefiles

[RussTreadon-NOAA]

Description

This PR modifies select machine modulefiles in modulefiles/GDAS to allow them to be loaded via

• module use ${path}/modulefiles/GDAS
• module load ${machine}.${comp}

Companion PRs

none

Issues

Resolves #1418

Automated CI tests to run in Global Workflow

• atm_jjob
• C96C48_ufs_hybatmDA
• C96C48_hybatmaerosnowDA
• C48mx500_3DVarAOWCDA
• C48mx500_hybAOWCDA
• C96C48_hybatmDA

[RussTreadon-NOAA]

The true problem is that myModuleVersion() returns the Boolean value false. This is accurate because the modulefile does not define a version. Converting Boolean value false to a string via tostring() is not the correct solution.

Close this PR until a proper solution is found.