[server] integration test for blob transfer between servers

[jingy-li]

Integration test for blob transfer between servers

• Minor bug fix for ServerBlobFinder. Previously initialize ServerBlobFinder need to wait for customizedViewRepository complete, it waits so long. Moving get customizedViewRepository when we need to find peer not in the constructor.
• Add integration test to do
  • Start 2 servers and a VPJ.
  • Remove one servers metadata partition and data partition
  • Restart server1.
  • Verify that the re-started server successfully ingest data from server2 via blob transfer.

How was this PR tested?

(1) Integration test: the partition file is transferred and the metadata is transferred and updated.
(2) Adding logs in updateStorePartitionMetadata to compare the offset record before and after the metadata update. Offset record is successfully transferred and used.

Does this PR introduce any user-facing changes?

• No. You can skip the rest of this section.
• Yes. Make sure to explain your proposed changes and call out the behavior change.

[adamxchen]

Thanks!