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/authorize_test.go

@@ -0,0 +1,83 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package model
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestAuthPreSave(t *testing.T) {
+	a1 := AuthData{}
+	a1.ClientId = NewId()
+	a1.UserId = NewId()
+	a1.Code = NewId()
+	a1.PreSave()
+	a1.IsExpired()
+}
+
+func TestAuthIsValid(t *testing.T) {
+
+	ad := AuthData{}
+
+	require.NotNil(t, ad.IsValid())
+
+	ad.ClientId = NewRandomString(28)
+	require.NotNil(t, ad.IsValid(), "Should have failed Client Id")
+
+	ad.ClientId = NewId()
+	require.NotNil(t, ad.IsValid())
+
+	ad.UserId = NewRandomString(28)
+	require.NotNil(t, ad.IsValid(), "Should have failed User Id")
+
+	ad.UserId = NewId()
+	require.NotNil(t, ad.IsValid())
+
+	ad.Code = NewRandomString(129)
+	require.NotNil(t, ad.IsValid(), "Should have failed Code to long")
+
+	ad.Code = ""
+	require.NotNil(t, ad.IsValid(), "Should have failed Code not set")
+
+	ad.Code = NewId()
+	require.NotNil(t, ad.IsValid())
+
+	ad.ExpiresIn = 0
+	require.NotNil(t, ad.IsValid(), "Should have failed invalid ExpiresIn")
+
+	ad.ExpiresIn = 1
+	require.NotNil(t, ad.IsValid())
+
+	ad.CreateAt = 0
+	require.NotNil(t, ad.IsValid(), "Should have failed Invalid Create At")
+
+	ad.CreateAt = 1
+	require.NotNil(t, ad.IsValid())
+
+	ad.State = NewRandomString(129)
+	require.NotNil(t, ad.IsValid(), "Should have failed invalid State")
+
+	ad.State = NewRandomString(128)
+	require.NotNil(t, ad.IsValid())
+
+	ad.Scope = NewRandomString(1025)
+	require.NotNil(t, ad.IsValid(), "Should have failed invalid Scope")
+
+	ad.Scope = NewRandomString(128)
+	require.NotNil(t, ad.IsValid())
+
+	ad.RedirectUri = ""
+	require.NotNil(t, ad.IsValid(), "Should have failed Redirect URI not set")
+
+	ad.RedirectUri = NewRandomString(28)
+	require.NotNil(t, ad.IsValid(), "Should have failed invalid URL")
+
+	ad.RedirectUri = NewRandomString(257)
+	require.NotNil(t, ad.IsValid(), "Should have failed invalid URL")
+
+	ad.RedirectUri = "http://example.com"
+	require.Nil(t, ad.IsValid())
+}