Remove a stray conflict resolution marker in RUNNING_TESTS.md

Author: michaelklishin

RUNNING_TESTS.md

@@ -166,8 +166,6 @@ Tests run: 121, Failures: 0, Errors: 0, Skipped: 0
 
 Test reports can be found in `target/failsafe-reports`.
 
-<<<<<<< HEAD
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 ## Running tests against an externally provided broker or cluster
 
 By default, if the RabbitMQ broker sources are available, the testsuite