Switch PackageContext functions to take a ctx

So that the Path and similar functions can be used directly, without
manually adding something like configErrorWrapper (it just uses it all
the time now).

Bug: 76168832
Test: out/soong/build.ninja is identical
Change-Id: I8cb524b09a84d0b8357d7c3501c71270af411e17
Merged-In: I8cb524b09a84d0b8357d7c3501c71270af411e17
(cherry picked from commit 54daaf03)