Add override integration test

[Skarlso]

Description

Closes #4972

Added a simple integration test to test functionality of overriding using two nodegroups and a configuration file. Nodegroup 1 is unmanaged and nodegroup 2 is managed, testing both at the same time.

Local run:

Ran 1 of 1 Specs in 1704.933 seconds
SUCCESS! -- 1 Passed | 0 Failed | 0 Pending | 0 Skipped
--- PASS: TestOverrideBootstrap (1704.93s)
PASS

Ginkgo ran 1 suite in 28m47.554883904s
Test Suite Passed

This is a basic test suite which can be extended upon later with various scenarios.

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the userdocs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes
• (Core team) Added labels for change area (e.g. area/nodegroup) and kind (e.g. kind/improvement)

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[Himangini]

👍🏻