[flutter_releases] Flutter beta 3.8.0-10.0.pre Framework Cherrypicks (#120946)

* Create candidate branch version flutter-3.8-candidate.10 for beta

* Update Engine revision to 639e313f998a27ae82a876e1c6c1374afae6f843 for beta release 3.8.0-10.0.pre
diff --git a/bin/internal/engine.version b/bin/internal/engine.version
index cb1be7a..914389b 100644
--- a/bin/internal/engine.version
+++ b/bin/internal/engine.version
@@ -1 +1 @@
-2f2e2e27cb285f518fd30b837029a5cca44b2ae5
+639e313f998a27ae82a876e1c6c1374afae6f843
diff --git a/bin/internal/release-candidate-branch.version b/bin/internal/release-candidate-branch.version
new file mode 100644
index 0000000..2c7191a
--- /dev/null
+++ b/bin/internal/release-candidate-branch.version
@@ -0,0 +1 @@
+flutter-3.8-candidate.10