Add bp2build conversion to reference to fdo_profile targets

The fdo_profile targets are handcrafted in ag/20469925. Bp2build creates fdo_profile attribute on cc_library_shared and references to the fdo_profile target if the profile exists. This works under assumption that all afdo profiles have an associated Bazel fdo_profile target declared in the same folder/package.

As noted in b/253540178, this won't work when we check in the BUILD files (which is likely 6+ months away) because some profiles might only exist internally but not in AOSP. We will implement a long-term solution once we figure out all the requirements we need to support afdo both in Soong and Bazel.

Bug: 253540178
Test: go tests
Change-Id: Iebd5dd7a76583b4b2bf0d9ee56d58f247d313a54
Merged-In: Iebd5dd7a76583b4b2bf0d9ee56d58f247d313a54