Remove duplicated ASAN test on PPC

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      format-stress-sanitizer-ppc-test on ubuntu1804-ppc

      Host: ubuntu1804-ppc-5.pic.build.10gen.cc
      Project: wiredtiger
      Commit: 2ecb02b5

      Task Logs:

              Assignee:
              Luke Chen
              Reporter:
              xgen-buildbaron-user
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                Created:
                Updated:
                Resolved: