Improve account copying (#1069)

With this fix, all nested slices and pointers will be copied by value.
Also, this fixes tests to compare the original and copy account by their
values by marshaling them to JSON strings.

Before that, they were copying the pointers that also passed the simple `=` compassion
(as the addresses match).

route/route.go

@@ -1,8 +1,9 @@
 package route
 
 import (
-	"github.com/netbirdio/netbird/management/server/status"
 	"net/netip"
+
+	"github.com/netbirdio/netbird/management/server/status"
 )
 
 // Windows has some limitation regarding metric size that differ from Unix-like systems.
@@ -83,7 +84,7 @@ func (r *Route) EventMeta() map[string]any {
 
 // Copy copies a route object
 func (r *Route) Copy() *Route {
-	return &Route{
+	route := &Route{
 		ID:          r.ID,
 		Description: r.Description,
 		NetID:       r.NetID,
@@ -93,8 +94,10 @@ func (r *Route) Copy() *Route {
 		Metric:      r.Metric,
 		Masquerade:  r.Masquerade,
 		Enabled:     r.Enabled,
-		Groups:      r.Groups,
+		Groups:      make([]string, len(r.Groups)),
 	}
+	copy(route.Groups, r.Groups)
+	return route
 }
 
 // IsEqual compares one route with the other