Making CosmosStore non final for easy mocking while testing

6 jobs for !9 with haaggarw/ind/7652848 in 4 minutes and 23 seconds (queued for 1 second)
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Status Name Job ID Coverage
  Review
passed trigger-trusted-tests #21698
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failed trigger-trusted-tests #21586
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failed trigger-trusted-tests #21585
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failed trigger-trusted-tests #21575
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failed trigger-trusted-tests #21574
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failed trigger-trusted-tests #17968
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