Stack: ignore state files

[DanielMSchmidt]

Previously the files were not successfully ignored

[danieldreier]

When I tested this (just by coping the gitignore line into a local one, my tfstate files were not ignored:

Untracked files:
  (use "git add <file>..." to include in what will be committed)
        terraform.tfstate
        terraform.tfstate.backup

[DanielMSchmidt]

Great catch, was your local project initialised with an older version or what is the reason your terraform state has no stack name in the state?

[ansgarm]

Just tested it successfully with a project that was initialized with cdktf 0.3 (supporting multiple stacks).
As these are the templates for initializing new projects, this PR won't affect existing projects such as that from @danieldreier.

[github-actions]

I'm going to lock this pull request because it has been closed for 30 days. This helps our maintainers find and focus on the active issues. If you've found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.