[Autofill Framework] Fix authentication id by limiting request id to only 15 bits.

Bug: b/347447740, b/349734277
Test: atest CtsAutofillServiceTestCases; atest FrameworkServiceTestCases:RequestIdTest
Flag: EXEMPT bugfix
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:26ebfeb5e2398fa0603fef63132308e4cd3c3dfc)
Merged-In: I2534d6a2fc388b582b2d0f13aa8640b477606fce
Change-Id: I2534d6a2fc388b582b2d0f13aa8640b477606fce