Transaction metrics not updated on TransientTransactionError

Same test as SERVER-36294 - 10 threads doing simple udpates to single independent documents.

At A 6 of the 10 threads got a TransientTransactionError, apparently (based on timing in chart above) because the in-progress transaction reaper job prevented them from acquiring a lock within 5ms:

Error: command failed: {

	"errorLabels" : [

		"TransientTransactionError"

	],

	"operationTime" : Timestamp(1532607909, 727),

	"ok" : 0,

	"errmsg" : "Unable to acquire lock '{6237343057549539649: Database, 1625657039122151745}' within a max lock request timeout of '5ms' milliseconds.",

	"code" : 24,

	"codeName" : "LockTimeout",

	"$clusterTime" : {

		"clusterTime" : Timestamp(1532607909, 727),

		"signature" : {

			"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),

			"keyId" : NumberLong(0)

		}

	}

}

The 10 threads continue, but the open and active counters are now stuck ranging from 6-16 instead of 0-10. Apparently the counters have not been decremented on the error.

At B I killed the mongo shell. It appears there was still one transaction open at that point because open is 7 and inactive is 1. At C after that transaction times out we remain stuck indefinitely with open at 6 and active at 6.