Migrate fuchsia to engine v2 builds. (#48042)

Bug: https://github.com/flutter/flutter/issues/135189
Bug: https://github.com/flutter/flutter/issues/132600
Bug: https://github.com/flutter/flutter/issues/126461

[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style

.ci.yaml

diff --git a/.ci.yaml b/.ci.yaml
index 2febae5..1e0a19e 100644
--- a/.ci.yaml
+++ b/.ci.yaml
@@ -162,6 +162,7 @@
     timeout: 60
 
   - name: Linux Fuchsia
+    bringup: true
     recipe: engine/engine
     properties:
       build_fuchsia: "true"
@@ -219,7 +220,6 @@
       - web_sdk/**
 
   - name: Linux linux_fuchsia
-    bringup: true
     recipe: engine_v2/engine_v2
     timeout: 60
     properties: