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/compliance_post_test.go

@@ -0,0 +1,45 @@
+// 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 TestCompliancePostHeader(t *testing.T) {
+	require.Equal(t, "TeamName", CompliancePostHeader()[0])
+}
+
+func TestCompliancePost(t *testing.T) {
+	o := CompliancePost{TeamName: "test", PostFileIds: "files", PostCreateAt: GetMillis()}
+	r := o.Row()
+
+	require.Equal(t, "test", r[0])
+	require.Equal(t, "files", r[len(r)-1])
+}
+
+var cleanTests = []struct {
+	in       string
+	expected string
+}{
+	{"hello", "hello"},
+	{"=hello", "'=hello"},
+	{"+hello", "'+hello"},
+	{"-hello", "'-hello"},
+	{"  =hello", "'  =hello"},
+	{"  +hello", "'  +hello"},
+	{"  -hello", "'  -hello"},
+	{"\t  -hello", "'\t  -hello"},
+}
+
+func TestCleanComplianceStrings(t *testing.T) {
+	for _, tt := range cleanTests {
+		actual := cleanComplianceStrings(tt.in)
+		if actual != tt.expected {
+			t.Errorf("cleanComplianceStrings(%v): expected %v, actual %v", tt.in, tt.expected, actual)
+		}
+	}
+}