feat: support import blocks by root module deployment

[shanewxy]

Problem:

Terraform import blocks are only allowed in the root module. Templates Including import blocks fail to deploy through the current child source module deployment approach.

Solution:

• Instead of a child module reference, clone the source repo and deploy it as the root module directly.
• Replace the attributes with a variable file.
• Use an override file to replace existing configurations(provider, terraform backend, sensitive variables and outputs)

Related Issue:
#2173