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/integrity.go

@@ -0,0 +1,58 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package model
+
+import (
+	"encoding/json"
+	"errors"
+)
+
+type OrphanedRecord struct {
+	ParentId *string `json:"parent_id"`
+	ChildId  *string `json:"child_id"`
+}
+
+type RelationalIntegrityCheckData struct {
+	ParentName   string           `json:"parent_name"`
+	ChildName    string           `json:"child_name"`
+	ParentIdAttr string           `json:"parent_id_attr"`
+	ChildIdAttr  string           `json:"child_id_attr"`
+	Records      []OrphanedRecord `json:"records"`
+}
+
+type IntegrityCheckResult struct {
+	Data any   `json:"data"`
+	Err  error `json:"err"`
+}
+
+func (r *IntegrityCheckResult) UnmarshalJSON(b []byte) error {
+	var data map[string]any
+	if err := json.Unmarshal(b, &data); err != nil {
+		return err
+	}
+	if d, ok := data["data"]; ok && d != nil {
+		var rdata RelationalIntegrityCheckData
+		m := d.(map[string]any)
+		rdata.ParentName = m["parent_name"].(string)
+		rdata.ChildName = m["child_name"].(string)
+		rdata.ParentIdAttr = m["parent_id_attr"].(string)
+		rdata.ChildIdAttr = m["child_id_attr"].(string)
+		for _, recData := range m["records"].([]any) {
+			var record OrphanedRecord
+			m := recData.(map[string]any)
+			if val := m["parent_id"]; val != nil {
+				record.ParentId = NewString(val.(string))
+			}
+			if val := m["child_id"]; val != nil {
+				record.ChildId = NewString(val.(string))
+			}
+			rdata.Records = append(rdata.Records, record)
+		}
+		r.Data = rdata
+	}
+	if err, ok := data["err"]; ok && err != nil {
+		r.Err = errors.New(data["err"].(string))
+	}
+	return nil
+}