feat: added data source for Stacks

[madhuravius]

Added a data source for stacks (searchable by stack name)

This works as is:

This also worked on redeploy:

And finally validated correctly on the dashboard:

[shortcut-integration[bot]]

This pull request has been linked to Shortcut Story #7090: Add Stack data source to Terraform provider.

[madhuravius]

The added integration tests ran for environments:

Validation tests also pass:

[madhuravius]

Added another client-based test that pulls stacks and checks the stack data resource:

[madhuravius]

Unless there's a time-boxable way to proceed, this will work:

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In an unset environment:

[madhuravius]

Tests should work after changes:

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Guard and comment are ugly on data source for stacks, but will allow us to get by for now The lack of env_id does not bother me because it would either not find the value in the client or there is another issue. i can replicate the same ugliness of stack there if you want me to use the client, but i'd like to keep that to a minimum (juice not worth the squeeze there)