feat: invite user link (#8578)

# Which Problems Are Solved

As an administrator I want to be able to invite users to my application
with the API V2, some user data I will already prefil, the user should
add the authentication method themself (password, passkey, sso).

# How the Problems Are Solved

- A user can now be created with a email explicitly set to false.
- If a user has no verified email and no authentication method, an
`InviteCode` can be created through the User V2 API.
  - the code can be returned or sent through email
- additionally `URLTemplate` and an `ApplicatioName` can provided for
the email
- The code can be resent and verified through the User V2 API
- The V1 login allows users to verify and resend the code and set a
password (analog user initialization)
- The message text for the user invitation can be customized

# Additional Changes

- `verifyUserPasskeyCode` directly uses `crypto.VerifyCode` (instead of
`verifyEncryptedCode`)
- `verifyEncryptedCode` is removed (unnecessarily queried for the code
generator)

# Additional Context

- closes #8310
- TODO: login V2 will have to implement invite flow:
https://github.com/zitadel/typescript/issues/166

internal/notification/types/invite_code.go

@@ -0,0 +1,31 @@
+package types
+
+import (
+	"context"
+	"strings"
+
+	http_utils "github.com/zitadel/zitadel/internal/api/http"
+	"github.com/zitadel/zitadel/internal/api/ui/login"
+	"github.com/zitadel/zitadel/internal/domain"
+	"github.com/zitadel/zitadel/internal/query"
+)
+
+func (notify Notify) SendInviteCode(ctx context.Context, user *query.NotifyUser, code, applicationName, urlTmpl, authRequestID string) error {
+	var url string
+	if applicationName == "" {
+		applicationName = "ZITADEL"
+	}
+	if urlTmpl == "" {
+		url = login.InviteUserLink(http_utils.DomainContext(ctx).Origin(), user.ID, user.PreferredLoginName, code, user.ResourceOwner, authRequestID)
+	} else {
+		var buf strings.Builder
+		if err := domain.RenderConfirmURLTemplate(&buf, urlTmpl, user.ID, code, user.ResourceOwner); err != nil {
+			return err
+		}
+		url = buf.String()
+	}
+	args := make(map[string]interface{})
+	args["Code"] = code
+	args["ApplicationName"] = applicationName
+	return notify(url, args, domain.InviteUserMessageType, true)
+}