* implementation of fallback logic for cosign, terraform

* tflint, terragrunt - wrote fallback logic for these

* misc change

* [Terraform] - fallback - apply

* changes as requested by review comments

* misc change

* misc change

* 2-step fallback implemented in install.sh, test cases yet to be updated

* install jq for ubuntu:focal, jammy & debian:11, 12

* test for terraform_docs updated

* tfsec test updated

* terraform fallback test updated

* misc change

* added tflint fallback test file

* terragrunt fallback test file added

* minor change in tfsec test file

* few more changes to cosign, terragrunt installations..

* changes to test files for terragrunt & cosign

* Changes acc. to review comments for pr

* changes requested

* changes as requested in review comments !