[Terraform] feature fallback fix

[gauravsaini04]

Feature name:

• Terraform

Description:

This PR introduces the following functionality:

• When the latest tag for packages/tools installed by terraform feature does not have a source binary released yet, then it will continue installing the previous working version for which a source binary will be available
• Packages for which patch has been applied to terraform feature - cosign, terraform, tflint, terragrunt, tfsec, terraform_docs

Changelog:

• Updated install.sh such that the fallback mechanism is properly configured for all these above listed tools/ packages
• Updated tests files to validate that when a fake version is tried to be downloaded with curl command thus representing a scenario when trying to access a source binary which is not deployed yet, then it will pick up the binary for the latest released tag which will eventually work successfully, and if github api limits are reached then will try to find a prev. version from find_prev_version_from_git_tags() function and get the binary for that instead.
• Have updated tests for all the above mentioned packages.

Checklist:

• Checked that applied changes work as expected

[samruddhikhandale]

Overall it looks great, left some comments

[samruddhikhandale]

Looks great, thank you! 🎉