fix: add mocked resources (#102)

## what

- Added mock providers for Spacelift data sources in
`resource-id-resolver.tftest.hcl` to make tests deterministic and not
dependent on external API calls.

## why
- The tests were failing because they relied on real Spacelift API
responses for name-to-ID resolution. This caused failures when AWS
integrations or other resources were renamed/deleted in the Spacelift
account.

## references

-
https://github.com/masterpointio/terraform-spacelift-automation/actions/runs/19815562739/job/56765940741?pr=100


<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit

* **Tests**
* Enhanced test infrastructure with mock data providers for improved
test simulation and validation capabilities.

<sub>✏️ Tip: You can customize this high-level summary in your review
settings.</sub>

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: gberenice

tests/resource-id-resolver.tftest.hcl

@@ -1,6 +1,66 @@
 # This test file validates the resource_id_resolver logic in main.tf which handles
 # name-to-ID resolution for Spacelift resources and when to use global vs stack-level values,
 # including Spaces, Worker Pools, and AWS Integrations, etc.
+
+mock_provider "spacelift" {
+  mock_data "spacelift_spaces" {
+    defaults = {
+      spaces = [
+        {
+          space_id    = "mp-aws-automation-01JK7A21DW1YH3Q64JHS3RYNP9"
+          name        = "mp-aws-automation"
+          parent_space_id = "root"
+          description = "Test space"
+          labels      = []
+          inherit_entities = true
+        }
+      ]
+    }
+  }
+
+  mock_data "spacelift_worker_pools" {
+    defaults = {
+      worker_pools = [
+        {
+          worker_pool_id           = "01K3VABYB4FBXNV24KN4A4EKC8"
+          name                     = "mp-ue1-automation-spft-priv-workers"
+          description              = "Test worker pool"
+          labels                   = []
+          config                   = ""
+          space_id                 = "root"
+          drift_detection_run_limit = 0
+        }
+      ]
+    }
+  }
+
+  mock_data "spacelift_aws_integrations" {
+    defaults = {
+      integrations = [
+        {
+          integration_id                 = "01JEC7ZACVKHTSVY4NF8QNZVVB"
+          name                           = "mp-automation-755965222190"
+          role_arn                       = "arn:aws:iam::755965222190:role/spacelift"
+          external_id                    = "test"
+          duration_seconds               = 3600
+          generate_credentials_in_worker = false
+          space_id                       = "root"
+          labels                         = []
+          region                         = "us-east-1"
+        }
+      ]
+    }
+  }
+}
+
+mock_provider "jsonschema" {
+  mock_data "jsonschema_validator" {
+    defaults = {
+      validated = "{}"
+    }
+  }
+}
+
 variables {
   root_modules_path  = "./tests/fixtures/multi-instance"
   common_config_file = "common.yaml"