Address #3922

This PR creates a new ZWE Integration Test Framework which focuses on delivering clear, easy-to-write tests for ZWE commands and uses Jest snapshots to capture and test command output. Higher fidelity tests could be written later with more intelligent analysis of zwe command output. More will be added to this description and the test README soon.

• Batteries Included - setup, teardown, smart runner, cfg-yaml autocomplete, test logs, clean snapshots
• zwe built from local repo, dependencies downloaded from manifest.json.template
• Minimum System Requirements (test user account must be able to run zwe commands)
• Jest Framework
• Configuration options to help speed up dev test creation and iteration
• CI Build and Nightly Build
• SHORT vs LONG test designation, as defined by requiring new runs of init generate vs sharing a single run. SHORT tests complete on average in ~100s per command group, of which up to ~50s is the single shared init generate command.

Limitations:

• Time: Each test which requires a modification to the zowe.yaml takes roughly 30s to run, bulk of which is backend job execution.
  • Mitigate via SHORT vs LONG designation and careful test design.
• Some ZWE commands cause the shell to hang. Still investigating.

To be completed before merge:

• A stable set of tests with committed snapshots. These are still changing frequently.
• Investigations into USS / Shell hangs.
• Verification of portability - run this on both internal systems and Marist environments.
• Github Action
• Code review feedback