Making ZOS module visible by default when running on ZOS in embedded JS

[JoeNemo]

configmgr runs scripts in two ways. top levels scripts are run assuming ES6 module loading. Embedded scripts inside yaml get a fixed environment w/o module loading, but some pre-loaded modules onto the "globalThis". This change adds the "zos" module to the preloads for embedded scripts.

Type of change

Please delete options that are not relevant.

• [ x] New feature (non-breaking change which adds functionality)

PR Checklist

Please delete options that are not relevant.

• [ x] If the changes in this PR are meant for the next release / mainline, this PR targets the "staging" branch.

• [ x] My code follows the style guidelines of this project (see: Contributing guideline)

• [x ] My changes generate no new warnings

• [ x] I have added tests that prove my fix is effective or that my feature works, or describe a test method below

Testing

run configmgr with -embeddedScript arg to test

[1000TurquoisePogs]

This allows me to template ${{ zos.resolveSymbol('&SYSNAME') }} which is very useful to me.

Make sure to update the CHANGELOG.md https://github.com/zowe/zowe-common-c/blob/feature/embedzos/CHANGELOG.md with an enhancement note for 2.10.