Adapt the existing uses of ReshardingMetrics in resharding related tests into a new test suite using ReshardingMetricsNew.

Files which contain usages of ReshardingMetrics:

• src/mongo/db/s/resharding_test_commands.cpp
• src/mongo/db/s/resharding/resharding_collection_cloner_test.cpp
• src/mongo/db/s/resharding/resharding_coordinator_commit_monitor_test.cpp
• src/mongo/db/s/resharding/resharding_oplog_batch_applier_test.cpp

Files which read from ReshardingMetrics as part of verifying correctness:

• src/mongo/db/s/resharding/resharding_coordinator_service_test.cpp
• src/mongo/db/s/resharding/resharding_donor_service_test.cpp
• src/mongo/db/s/resharding/resharding_oplog_applier_test.cpp
• src/mongo/db/s/resharding/resharding_oplog_fetcher_test.cpp
• src/mongo/db/s/resharding/resharding_recipient_service_test.cpp