fix: added inference of organization id for environment resource proof

[madhuravius]

TODOS:

• [x] Update documentation for org_id to be optional as it can be inferred in certain scenarios
• [x] Automatic test cases where possible
• [x] Test cases below:

✅ Manual test case 1: orgid can be inferred from dedicated stack (had to force my stack to be private and assigned an org id via rails console) ✅ Manual test case 2: orgid can be inferred from user ✅ Manual test case 3: orgid must be specific explicitly, because above two conditions not met

Manual test case 3: orgid must be specific explicitly, because above two conditions not met

I hit this error block as expected when no conditions were met:

• I did not specify organization id explicitly
• I am part of multiple organizations
• My stack was not a dedicated stack (thus missing an org id)

I used the below terraform:

terraform {
  required_providers {
    aptible = {
      source  = "aptible.com/aptible/aptible"
    }
  }
}

data "aptible_stack" "stack" {
  name = var.stack_name
}

resource "aptible_environment" "example" {
  handle = "test_environment_123456"
  stack_id = data.aptible_stack.stack.stack_id
}

The above case is fine if provided manually:

[shortcut-integration[bot]]

This pull request has been linked to Shortcut Story #7097: Calculate organization ID for Environments.

[madhuravius]

Inferred from user (non dedicated stack):

---

Inferred from stack (dedicated stack), had to disable auth api endpoint to verify:

[madhuravius]

The new test case passes for me locally but may not pass in CI unless there are specific conditions met (user is part of one org OR is dedicated stack)