[MM-10718] Move custom branding to TE (#8871)

* move custom branding to TE
* move brand's enterprise code to server and remove BrandInterface

utils/license.go

@@ -137,7 +137,6 @@ func GetClientLicense(l *model.License) map[string]string {
 		props["GoogleOAuth"] = strconv.FormatBool(*l.Features.GoogleOAuth)
 		props["Office365OAuth"] = strconv.FormatBool(*l.Features.Office365OAuth)
 		props["Compliance"] = strconv.FormatBool(*l.Features.Compliance)
-		props["CustomBrand"] = strconv.FormatBool(*l.Features.CustomBrand)
 		props["MHPNS"] = strconv.FormatBool(*l.Features.MHPNS)
 		props["Announcement"] = strconv.FormatBool(*l.Features.Announcement)
 		props["Elasticsearch"] = strconv.FormatBool(*l.Features.Elasticsearch)