[flutter_releases] Flutter beta 2.7.0-3.0.pre Framework Cherrypicks (#92104)

* 'add branch flutter-2.7-candidate.3 to enabled_branches in .ci.yaml'

* 'Update Engine revision to bbba2b2437d739a455ecafb66a22a46d31b233ed for beta release 2.7.0-3.0.pre'

* Update dimension for Linux/Android tests.
diff --git a/.ci.yaml b/.ci.yaml
index 036ec37..fc0ffa3 100755
--- a/.ci.yaml
+++ b/.ci.yaml
@@ -6,6 +6,7 @@
 # More information at:
 #  * https://github.com/flutter/cocoon/blob/master/CI_YAML.md
 enabled_branches:
+  - flutter-2.7-candidate.3
   - master
   - dev
   - beta
@@ -47,7 +48,7 @@
           {"dependency": "curl"},
           {"dependency": "open_jdk"}
         ]
-      os: Android
+      os: Linux
       device_os: "N"
   mac:
     properties:
diff --git a/bin/internal/engine.version b/bin/internal/engine.version
index fc1bedf..fff707a 100644
--- a/bin/internal/engine.version
+++ b/bin/internal/engine.version
@@ -1 +1 @@
-c7714158950347bd54b1a33af20aaf902a6a0c41
+bbba2b2437d739a455ecafb66a22a46d31b233ed