Remove flaky label from queue test suites

Tests that are flake by default do not increase confidence on any
code base. Just test cases that have external dependencies should
be marked as such.

Some work has been done to make these test suites more resilient,
but not all time-dependent issues are detected on our dev boxes.
It is essential to obtain CI reports of such failures, so we can
make the tests more robust and fix any hidden bug.

Author: dcorbacho

deps/rabbit/BUILD.bazel

@@ -589,7 +589,6 @@ rabbitmq_integration_suite(
 rabbitmq_integration_suite(
     name = "per_vhost_connection_limit_SUITE",
     size = "medium",
-    flaky = True,
 )
 
 rabbitmq_integration_suite(
@@ -652,7 +651,6 @@ rabbitmq_integration_suite(
     additional_beam = [
         ":test_quorum_queue_utils_beam",
     ],
-    flaky = True,
     shard_count = 6,
 )
 
@@ -667,7 +665,6 @@ rabbitmq_integration_suite(
     additional_beam = [
         ":test_quorum_queue_utils_beam",
     ],
-    flaky = True,
     shard_count = 6,
 )
 
@@ -794,7 +791,6 @@ rabbitmq_integration_suite(
     additional_beam = [
         ":test_quorum_queue_utils_beam",
     ],
-    flaky = True,
     shard_count = 12,
     deps = [
         "@proper//:erlang_app",