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/domain/custom_message_text.go

@@ -17,6 +17,7 @@ const (
 	DomainClaimedMessageType            = "DomainClaimed"
 	PasswordlessRegistrationMessageType = "PasswordlessRegistration"
 	PasswordChangeMessageType           = "PasswordChange"
+	InviteUserMessageType               = "InviteUser"
 	MessageTitle                        = "Title"
 	MessagePreHeader                    = "PreHeader"
 	MessageSubject                      = "Subject"
@@ -26,16 +27,6 @@ const (
 	MessageFooterText                   = "Footer"
 )
 
-type MessageTexts struct {
-	InitCode                 CustomMessageText
-	PasswordReset            CustomMessageText
-	VerifyEmail              CustomMessageText
-	VerifyPhone              CustomMessageText
-	DomainClaimed            CustomMessageText
-	PasswordlessRegistration CustomMessageText
-	PasswordChange           CustomMessageText
-}
-
 type CustomMessageText struct {
 	models.ObjectRoot
 
@@ -71,5 +62,6 @@ func IsMessageTextType(textType string) bool {
 		textType == VerifyEmailOTPMessageType ||
 		textType == DomainClaimedMessageType ||
 		textType == PasswordlessRegistrationMessageType ||
-		textType == PasswordChangeMessageType
+		textType == PasswordChangeMessageType ||
+		textType == InviteUserMessageType
 }