[skip ci]/update k3d script - organize environment variables

Merge Request

Changes

• Updating the version of k3d to 5.4.4 which is kubernetes v1.23.8
• Script now allows for users to run both inside the bigbang aws account (for those who have access) and allows external entities to use their own aws resources.
• Pre-flight checks added to ensure profile exists, vpc exists for easier debugging

Note - There are likely other ways to make this script more configurable. Not looking to burn a lot of time here right now and believe any future enhancements may still pull value from the new preflight checks.

Package MR

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