MM-27989 Remove experimental setting for data prefetch (#16306)

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

model/config.go

@@ -333,7 +333,6 @@ type ServiceSettings struct {
 	ExperimentalGroupUnreadChannels                   *string  `access:"experimental"`
 	ExperimentalChannelOrganization                   *bool    `access:"experimental"`
 	ExperimentalChannelSidebarOrganization            *string  `access:"experimental"`
-	ExperimentalDataPrefetch                          *bool    `access:"experimental"`
 	DEPRECATED_DO_NOT_USE_ImageProxyType              *string  `json:"ImageProxyType" mapstructure:"ImageProxyType"`       // This field is deprecated and must not be used.
 	DEPRECATED_DO_NOT_USE_ImageProxyURL               *string  `json:"ImageProxyURL" mapstructure:"ImageProxyURL"`         // This field is deprecated and must not be used.
 	DEPRECATED_DO_NOT_USE_ImageProxyOptions           *string  `json:"ImageProxyOptions" mapstructure:"ImageProxyOptions"` // This field is deprecated and must not be used.
@@ -699,10 +698,6 @@ func (s *ServiceSettings) SetDefaults(isUpdate bool) {
 		s.ExperimentalChannelSidebarOrganization = NewString("disabled")
 	}
 
-	if s.ExperimentalDataPrefetch == nil {
-		s.ExperimentalDataPrefetch = NewBool(true)
-	}
-
 	if s.DEPRECATED_DO_NOT_USE_ImageProxyType == nil {
 		s.DEPRECATED_DO_NOT_USE_ImageProxyType = NewString("")
 	}