More ReadyWatcher to MockFunction cleanup (#40900)

Commit Message: More ReadyWatcher to MockFunction cleanup

Signed-off-by: Raven Black <[email protected]>

Author: ravenblackx

test/common/event/BUILD

@@ -36,7 +36,6 @@ envoy_cc_test(
         "//source/common/event:dispatcher_includes",
         "//source/common/event:dispatcher_lib",
         "//source/common/stats:isolated_store_lib",
-        "//test/mocks:common_lib",
         "//test/test_common:environment_lib",
         "//test/test_common:test_runtime_lib",
         "//test/test_common:utility_lib",