Adds optional security linting for Terraform

[cesar-rodriguez]

Proposed Changes

1. Adding optional security linting of terraform files
2. This uses Terrascan with the VALIDATE_TERRAFORM_TERRASCAN environment variable
3. The VALIDATE_TERRAFORM_TERRASCAN variable is set to "false" by default

Readiness Checklist

• Label as breaking if this is a large fundamental change
• Label as either automation, bug, documentation, enhancement, infrastructure, or performance

[admiralAwkbar]

@cesar-rodriguez Really nice work!

I took the liberty to remove a dead groovy loop that was bad merged in...

Also, you had it default to false, but all other linters default to true, so I wanted to keep it on the same level and consistency in action. Hope that isn't a big issue?

[admiralAwkbar]

So dope

[cesar-rodriguez]

@cesar-rodriguez Really nice work!

I took the liberty to remove a dead groovy loop that was bad merged in...

Also, you had it default to false, but all other linters default to true, so I wanted to keep it on the same level and consistency in action. Hope that isn't a big issue?

Sounds good.