fix: only count preview branches toward the preview branch limit (#4283)

Author: carderne

.server-changes/fix-preview-branch-limit-count.md

@@ -0,0 +1,6 @@
+---
+area: webapp
+type: fix
+---
+
+The "Preview branches" usage on the Limits page now counts only preview branches.

apps/webapp/app/presenters/v3/LimitsPresenter.server.ts

@@ -155,7 +155,8 @@ export class LimitsPresenter extends BasePresenter {
     const activeBranchCount = await this._replica.runtimeEnvironment.count({
       where: {
         projectId,
-        branchName: {
+        type: "PREVIEW",
+        parentEnvironmentId: {
           not: null,
         },
         archivedAt: null,