[clang] [analyzer] Print the callee name in CallEnter in exploded-graph-rewriter (PR #116225)

[Donát Nagy via cfe-commits]

https://github.com/NagyDonat approved this pull request.

LGTM, with one minor simplification suggestion marked in an inline comment.

Disclaimer: I don't use this exploded-graph-rewriter tool, but the change seems to be straightforward and useful.

https://github.com/llvm/llvm-project/pull/116225