Make engine ToT assertion equal to flutter sdk engine.version a print statement.

After the issue of this assertion blocking the release team even though it is desired for the ToT for engine to sometimes not align with flutter sdk engine.version, updating the assertion to instead be a informative print statement might help reduce blocking.

Change-Id: I10db93a23959e3ffe49d37c956f11c1fdbcf5eab
Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/50500
Reviewed-by: Godofredo Contreras <godofredoc@google.com>
Commit-Queue: Jesse Seales <jseales@google.com>
diff --git a/recipes/release/release_publish.py b/recipes/release/release_publish.py
index 0aa3f3f..f29928c 100644
--- a/recipes/release/release_publish.py
+++ b/recipes/release/release_publish.py
@@ -112,7 +112,10 @@
 
   engine_version = GetEngineVersion(api, flutter_checkout)
   engine_tot = '' if api.repo_util._test_data.enabled else engine_tot
-  assert engine_tot == engine_version
+  if engine_tot != engine_version:  # pragma: no cover
+    api.step(
+        '(Warning) engine.version in flutter sdk does not match engine ToT', []
+    )
 
   for repo in ('flutter', 'engine'):
     env = env_flutter if repo == 'flutter' else env_engine