Turn focalboard plugin on by default (#18132)

* turn focalboard plugin on by default

* cleanup

* update config diff tests to add new default

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

model/config.go

@@ -2713,6 +2713,11 @@ func (s *PluginSettings) SetDefaults(ls LogSettings) {
 		s.PluginStates["com.mattermost.plugin-channel-export"] = &PluginState{Enable: true}
 	}
 
+	if s.PluginStates["focalboard"] == nil {
+		// Enable the focalboard plugin by default
+		s.PluginStates["focalboard"] = &PluginState{Enable: true}
+	}
+
 	if s.EnableMarketplace == nil {
 		s.EnableMarketplace = NewBool(PluginSettingsDefaultEnableMarketplace)
 	}

model/config_test.go

@@ -378,6 +378,30 @@ func TestConfigDefaultChannelExportPluginState(t *testing.T) {
 	})
 }
 
+func TestConfigDefaultFocalboardPluginState(t *testing.T) {
+	t.Run("should enable Focalboard plugin by default", func(t *testing.T) {
+		c1 := Config{}
+		c1.SetDefaults()
+
+		assert.True(t, c1.PluginSettings.PluginStates["focalboard"].Enable)
+	})
+
+	t.Run("should not re-enable focalboard plugin after it has been disabled", func(t *testing.T) {
+		c1 := Config{
+			PluginSettings: PluginSettings{
+				PluginStates: map[string]*PluginState{
+					"focalboard": {
+						Enable: false,
+					},
+				},
+			},
+		}
+
+		c1.SetDefaults()
+		assert.False(t, c1.PluginSettings.PluginStates["focalboard"].Enable)
+	})
+}
+
 func TestTeamSettingsIsValidSiteNameEmpty(t *testing.T) {
 	c1 := Config{}
 	c1.SetDefaults()