fix(autocomplete): derive the input test ids from testID

[bataevvlad]

Problem

Autocomplete passes the consumer testID to its options Popover and gives its Input the fixed test id @autocomplete/input. Every autocomplete's field is therefore @@autocomplete/input/input, so two autocompletes on one screen cannot be told apart in tests (found while testing textInputRef in #1927: the showcase's input-native-ref-autocomplete field was exposed as @@autocomplete/input/input).

Fix

The input's test id is derived from testID: @<testID>/input, which Input turns into @@<testID>/input/input for the field and @@<testID>/input/container for its container. Without a testID it keeps @autocomplete/input. The showcase autocomplete uses testID='autocomplete', so its ids and the autocomplete.ad replay are unchanged. The Popover keeps the consumer testID. JSDoc and a docs row describe the ids.

Verification

• Specs (autocomplete.spec.tsx): two autocompletes expose @@from/input/input and @@to/input/input; no testID keeps @@autocomplete/input/input. The first fails on master.
• Android emulator (Pixel 7, API 34): AutocompleteBlur (testID='autocomplete-blur') exposes @@autocomplete-blur/input/input next to @@autocomplete/input/input; fill by the new id filters the list.
• iOS simulator (iPhone 17): typing in both showcase autocompletes still works. The iOS accessibility tree is cut off before AutocompleteBlur on master (fixed by test(e2e): keep modals inside the snapshot budget #1918), so the id itself was checked on Android and in jest.
• Gates: autocomplete specs (26 pass), lint (0 errors).

Changeset: @ui-kitten/components patch.