[GWP-ASan] Add debuggerd end-to-end tests and remove unique wording.

Looks like we unintentionally had a breakage after aosp/1595302, where
both GWP-ASan and MTE tests started failing because the extra
information wasn't plumbed through the tombstones. MTE has end-to-end
tests but aren't run continuously, and GWP-ASan was missing the e2e
tests.

Also remove some unique wording for GWP-ASan, a UaF on the free'd
pointer is now "0 bytes into a 16-byte allocation" instead of "on a
16-byte allocation". The former is more descriptive and is more
ubiquitously used in our tooling.

This patch adds the E2E tests, but the underlying problem needs to be
fixed as well, before this patch can land.

Bug: 182489365
Test: atest debuggerd_test
Change-Id: I0fe8aba7ea443b3071724987f46b19a6525cda3c