[INTERNAL] sap.ui.rta: use FeaturesAPI instead of Settings directly
[INTERNAL] sap.ui.rta: use FeaturesAPI instead of Settings directly

- make use of FeaturesAPI.isPublishAvailable

Change-Id: I51fb47b10924b9147e8dcb9ac1b1597a0eccea41
Signed-off-by: Kevin Edinger <2cd308f6e534f22a23b481bd971d726fce0a3425@sap.com>

SAP/openui5,SAP/openui5,SAP/openui5,SAP/openui5