Rename FAST stages preparing for eventual deprecation (#3298)

* renames

* links

* readme

* docs

* update pf modules tests for renames

* condition_vars context in modules

* data platform dataset

* fix links in stage 3 docs

* schema changes

* schema docs

* tfdoc

* update duplicates check

* fast legacy tests

* legacy schema

* fix tests

modules/project-factory/budgets.tf

@@ -0,0 +1,33 @@
+/**
+ * Copyright 2025 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+# tfdoc:file:description Billing budget factory locals.
+
+module "billing-budgets" {
+  source = "../billing-account"
+  count  = var.factories_config.budgets != null ? 1 : 0
+  id     = var.factories_config.budgets.billing_account_id
+  context = merge(local.ctx, {
+    folder_ids  = local.ctx.folder_ids
+    project_ids = local.ctx_project_ids
+  })
+  factories_config = {
+    budgets_data_path = var.factories_config.budgets.data
+  }
+  budget_notification_channels = (
+    var.notification_channels
+  )
+}