MM-58847 Sanitize User (#27471)

* add more fields to sanitizeInput on User

* add test for user sanoitizeInput

* add more fields

* remove line, lint fix

* additional fields and sanitize update

* Update user_test.go

* remove fields that are unnecessary to check

* add check to test

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

server/public/model/user.go

@@ -686,6 +686,8 @@ func (u *User) SanitizeInput(isAdmin bool) {
 		u.EmailVerified = false
 	}
 	u.RemoteId = NewString("")
+	u.CreateAt = 0
+	u.UpdateAt = 0
 	u.DeleteAt = 0
 	u.LastPasswordUpdate = 0
 	u.LastPictureUpdate = 0
@@ -693,6 +695,7 @@ func (u *User) SanitizeInput(isAdmin bool) {
 	u.MfaActive = false
 	u.MfaSecret = ""
 	u.Email = strings.TrimSpace(u.Email)
+	u.LastActivityAt = 0
 }
 
 func (u *User) ClearNonProfileFields(asAdmin bool) {