[clang] [clang][analyzer] Remove boolean per-entry-point metrics (PR #162817)

[Arseniy Zaostrovnykh via cfe-commits]

necto wrote:

@balazs-benics-sonarsource is traveling right now, but we discussed this change today and he agrees with it, so I will merge, to unblock my follow-up PR

https://github.com/llvm/llvm-project/pull/162817