Boards as persisted category (#3877)

* WIP

* WIP

* Removed unused webapp util

* Added server tests

* Lint fix

* Updating existing tests

* Updating existing tests

* Updating existing tests

* Fixing existing tests

* Fixing existing tests

* Fixing existing tests

* Added category type and tests

* updated tests

* Fixed integration test

* type fix

* removed seconds from boards name

* wip

* debugging cy test

* Fixed a bug preventing users from collapsing boards category

* Debugging cypress test

* CI

* debugging cy test

* Testing a fix

* reverting test fix

* Handled personal server

* Fixed a case for personal server

* fixed a test

server/model/category.go

@@ -2,12 +2,18 @@ package model
 
 import (
 	"encoding/json"
+	"fmt"
 	"io"
 	"strings"
 
 	"github.com/mattermost/focalboard/server/utils"
 )
 
+const (
+	CategoryTypeSystem = "system"
+	CategoryTypeCustom = "custom"
+)
+
 // Category is a board category
 // swagger:model
 type Category struct {
@@ -42,12 +48,19 @@ type Category struct {
 	// Category's state in client side
 	// required: true
 	Collapsed bool `json:"collapsed"`
+
+	// Category's type
+	// required: true
+	Type string `json:"type"`
 }
 
 func (c *Category) Hydrate() {
 	c.ID = utils.NewID(utils.IDTypeNone)
 	c.CreateAt = utils.GetMillis()
 	c.UpdateAt = c.CreateAt
+	if c.Type == "" {
+		c.Type = CategoryTypeCustom
+	}
 }
 
 func (c *Category) IsValid() error {
@@ -67,6 +80,10 @@ func (c *Category) IsValid() error {
 		return NewErrInvalidCategory("category team id ID cannot be empty")
 	}
 
+	if c.Type != CategoryTypeCustom && c.Type != CategoryTypeSystem {
+		return NewErrInvalidCategory(fmt.Sprintf("category type is invalid. Allowed types: %s and %s", CategoryTypeSystem, CategoryTypeCustom))
+	}
+
 	return nil
 }