Move server-side relay auth out of shared and drop the unused validator

relay/auth/validator.go

@@ -0,0 +1,19 @@
+package auth
+
+import (
+	authv2 "github.com/netbirdio/netbird/shared/relay/auth/hmac/v2"
+)
+
+type TimedHMACValidator struct {
+	authenticatorV2 *authv2.Validator
+}
+
+func NewTimedHMACValidator(secret []byte) *TimedHMACValidator {
+	return &TimedHMACValidator{
+		authenticatorV2: authv2.NewValidator(secret),
+	}
+}
+
+func (a *TimedHMACValidator) Validate(credentials any) error {
+	return a.authenticatorV2.Validate(credentials)
+}