fix a few small bugs

[mcalhoun]

what

• Update incorrect provider config
• Remove unused variable
• Add .terraform.lock.hcl to the .gitignore

why

• The main driver for this PR was that we previously had:

required_providers {
    local = {
      source  = "hashicorp/aws"
      version = ">= 3.0"
    }
  }
}

This lead to a misconfiguration which caused the AWS provider not to function properly and lead to several hours of debugging.

[mcalhoun]

/test all