ICSHWI-12497: show loading icons in autocomplete fields

This is most-prompted by the create IOC dialog, however the Autocomplete fields are also used in the deploy revision of IOC dialogue, and the IOC details management and admin tabs (management: deploy revision, admin: modify ioc, change deployment host)

Adds loading text and loading icon adornment per https://v4.mui.com/components/autocomplete/#asynchronous-requests for V4 of MUI. Note that in the admin page this is complicated by fields being possibly disabled (which in itself has its own logic) so this is broken out so that e.g. the loading icon only shows when the field is enabled.