kv,admission: add missing admission headers

This patch adds missing admission headers in a couple of places:
`txn_interceptor_heartbeater` and `replica_range_lease`. Batch requests
coming from these code paths are expected to bypass AC. Empty admission
headers were accomplishing the same goal but this makes it more clear at
what the intention is.

Informs #112680

Release note: None

pkg/kv/kvclient/kvcoord/txn_interceptor_heartbeater.go

@@ -525,6 +525,13 @@ func (h *txnHeartbeater) abortTxnAsyncLocked(ctx context.Context) {
 		// concurrent requests from failing to notice the transaction was aborted.
 		Poison: true,
 	})
+	// NB: Setting `Source: kvpb.AdmissionHeader_OTHER` means this request will
+	// bypass AC.
+	ba.AdmissionHeader = kvpb.AdmissionHeader{
+		Priority:   txn.AdmissionPriority,
+		CreateTime: timeutil.Now().UnixNano(),
+		Source:     kvpb.AdmissionHeader_OTHER,
+	}
 
 	const taskName = "txnHeartbeater: aborting txn"
 	log.VEventf(ctx, 2, "async abort for txn: %s", txn)

pkg/kv/kvserver/replica_range_lease.go

@@ -58,6 +58,7 @@ import (
 	"github.com/cockroachdb/cockroach/pkg/roachpb"
 	"github.com/cockroachdb/cockroach/pkg/settings"
 	"github.com/cockroachdb/cockroach/pkg/util"
+	"github.com/cockroachdb/cockroach/pkg/util/admission/admissionpb"
 	"github.com/cockroachdb/cockroach/pkg/util/envutil"
 	"github.com/cockroachdb/cockroach/pkg/util/growstack"
 	"github.com/cockroachdb/cockroach/pkg/util/hlc"
@@ -571,6 +572,13 @@ func (p *pendingLeaseRequest) requestLease(
 	// lease when the range is unavailable results in, essentially, giving
 	// up on the lease and thus worsening the situation.
 	ba.Add(leaseReq)
+	// NB: Setting `Source: kvpb.AdmissionHeader_OTHER` means this request will
+	// bypass AC.
+	ba.AdmissionHeader = kvpb.AdmissionHeader{
+		Priority:   int32(admissionpb.NormalPri),
+		CreateTime: timeutil.Now().UnixNano(),
+		Source:     kvpb.AdmissionHeader_OTHER,
+	}
 	_, pErr := p.repl.Send(ctx, ba)
 	return pErr.GoError()
 }