Update github action set-output to use new environment file

[stcui007]

Make changes in github actions to use the new github environment file to prepare for anticipated deprecation of "set-output"

Additions

Removals

Changes

.github/actions/ngen-build/action.yaml
.github/actions/ngen-submod-build/action.yaml

Testing

Screenshots

Notes

Todos

Checklist

• [x ] PR has an informative and human-readable title
• [x ] Changes are limited to a single goal (no scope creep)
• [x ] Code can be automatically merged (no conflicts)
• [x ] Code follows project standards (link if applicable)
• Passes all existing automated tests
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Placeholder code is flagged / future todos are captured in comments
• Project documentation has been updated (including the "Unreleased" section of the CHANGELOG)
• Reviewers requested with the Reviewers tool ➡️

Testing checklist (automated report can be put here)

Target Environment support

• [x ] Linux