v8.0 module release (#22975)

https://mattermost.atlassian.net/browse/MM-52079

```release-note
We upgrade the module version to 8.0. The new module path is github.com/mattermost-server/server/v8.
```


Co-authored-by: Doug Lauder <wiggin77@warpmail.net>

server/model/switch_request.go

@@ -0,0 +1,48 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package model
+
+type SwitchRequest struct {
+	CurrentService string `json:"current_service"`
+	NewService     string `json:"new_service"`
+	Email          string `json:"email"`
+	Password       string `json:"password"`
+	NewPassword    string `json:"new_password"`
+	MfaCode        string `json:"mfa_code"`
+	LdapLoginId    string `json:"ldap_id"`
+}
+
+func (o *SwitchRequest) Auditable() map[string]interface{} {
+	return map[string]interface{}{
+		"current_service": o.CurrentService,
+		"new_service":     o.NewService,
+		"email":           o.Email,
+		"ldap_login_id":   o.LdapLoginId,
+	}
+}
+
+func (o *SwitchRequest) EmailToOAuth() bool {
+	return o.CurrentService == UserAuthServiceEmail &&
+		(o.NewService == UserAuthServiceSaml ||
+			o.NewService == UserAuthServiceGitlab ||
+			o.NewService == ServiceGoogle ||
+			o.NewService == ServiceOffice365 ||
+			o.NewService == ServiceOpenid)
+}
+
+func (o *SwitchRequest) OAuthToEmail() bool {
+	return (o.CurrentService == UserAuthServiceSaml ||
+		o.CurrentService == UserAuthServiceGitlab ||
+		o.CurrentService == ServiceGoogle ||
+		o.CurrentService == ServiceOffice365 ||
+		o.CurrentService == ServiceOpenid) && o.NewService == UserAuthServiceEmail
+}
+
+func (o *SwitchRequest) EmailToLdap() bool {
+	return o.CurrentService == UserAuthServiceEmail && o.NewService == UserAuthServiceLdap
+}
+
+func (o *SwitchRequest) LdapToEmail() bool {
+	return o.CurrentService == UserAuthServiceLdap && o.NewService == UserAuthServiceEmail
+}