feat: add agentapi endpoint to report connections for audit (#16507)

This change adds a new `ReportConnection` endpoint to the `agentapi`.

The protocol version was bumped previously, so it has been omitted here.

This allows the agent to report connection events, for example when the
user connects to the workspace via SSH or VS Code.

Updates #15139

coderd/audit/request.go

@@ -9,6 +9,7 @@ import (
 	"net"
 	"net/http"
 	"strconv"
+	"time"
 
 	"github.com/google/uuid"
 	"github.com/sqlc-dev/pqtype"
@@ -65,6 +66,7 @@ type BackgroundAuditParams[T Auditable] struct {
 
 	UserID         uuid.UUID
 	RequestID      uuid.UUID
+	Time           time.Time
 	Status         int
 	Action         database.AuditAction
 	OrganizationID uuid.UUID
@@ -461,13 +463,19 @@ func BackgroundAudit[T Auditable](ctx context.Context, p *BackgroundAuditParams[
 		diffRaw = []byte("{}")
 	}
 
+	if p.Time.IsZero() {
+		p.Time = dbtime.Now()
+	} else {
+		// NOTE(mafredri): dbtime.Time does not currently enforce UTC.
+		p.Time = dbtime.Time(p.Time.In(time.UTC))
+	}
 	if p.AdditionalFields == nil {
 		p.AdditionalFields = json.RawMessage("{}")
 	}
 
 	auditLog := database.AuditLog{
 		ID:               uuid.New(),
-		Time:             dbtime.Now(),
+		Time:             p.Time,
 		UserID:           p.UserID,
 		OrganizationID:   requireOrgID[T](ctx, p.OrganizationID, p.Log),
 		Ip:               ip,