[BOLT] Cover all call sites in writeBATYAML

Call site information setting was conditioned on branch information
presence for a given block. However, it's possible to have sampled
profile lacking one or the other for a given basic block.

Iterate over branch profiles and call profiles independently to cover
all recorded profile data.

Depends on https://github.com/llvm/llvm-project/pull/87569

Test Plan: Updated bolt/test/X86/yaml-secondary-entry-discriminator.s

Reviewers: ayermolo, dcci, maksfb, rafaelauler

Reviewed By: maksfb

Pull Request: https://github.com/llvm/llvm-project/pull/87743