[INTERNAL] sap.m.Select: Improve aria-roledescription announcement
[INTERNAL] sap.m.Select: Improve aria-roledescription announcement

Add the text Combo Box to the aria-roledescription value.

Change-Id: Ica1d4fb8f886c63f026cce18be3bd7a1e93a8776
BCP: 2170236714

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