Skip flaky test: reporter_spec.rb

What does this MR do and why?

Failed job: https://jihulab.com/gitlab-cn/gitlab/-/jobs/7682678

Skip flaky cases:

- file_path: 'spec/lib/gitlab/memory/reporter_spec.rb'
  description:
    - 'Gitlab::Memory::Reporter#run_report when reports path is specified via environment behaves like runs and stores reports when an error occurs when cause was compression command failing behaves like handles errors gracefully logs the error and returns false'
    - 'Gitlab::Memory::Reporter#run_report when reports path is not specified behaves like runs and stores reports when an error occurs when cause was compression command failing behaves like handles errors gracefully logs the error and returns false'

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