Shard the eager_sync_SUITE by case

This suite contains only one group, but is long enough to warrant
sharding. This is probably a bit of a time penalty in absolute terms
because init_per_suite and init_per_group re-run in each shard.

deps/rabbit/BUILD.bazel

@@ -415,6 +415,15 @@ rabbitmq_integration_suite(
         ":sync_detection_SUITE_beam_files",
     ],
     suite_name = "eager_sync_SUITE",
+    groups = {
+        "non_parallel_tests": [
+            "eager_sync",
+            "eager_sync_cancel",
+            "eager_sync_auto",
+            "eager_sync_auto_on_policy_change",
+            "eager_sync_requeue",
+        ],
+    },
     deps = DEPS,
 )
 

deps/rabbit/test/eager_sync_SUITE.erl

@@ -32,6 +32,12 @@ groups() ->
         ]}
     ].
 
+suite() ->
+    [
+      %% If a test hangs, no need to wait for 30 minutes.
+      {timetrap, {minutes, 15}}
+    ].
+
 %% -------------------------------------------------------------------
 %% Testsuite setup/teardown.
 %% -------------------------------------------------------------------