[clang][analyzer] Add SyntaxRunningTime per-entry-point metric (#163341) Per-entry-point metrics are captured during the path-sensitive analysis time. For that reason, it is not trivial to add the syntax-only analysis time as it runs in a separate stage. Luckily syntax-only analysis is done before path-senstivie analysis. I use the function summary field to keep the syntax-only anlaysis time once syntax analysis is done, and then forward it to the per-EP metrics snapshot during the path-sensitive analysis. Note that some of the entry points that were analyzed by syntax-only rules may be missing in the CSV export if they were never analyzed by path-sensitive rules. Conversely, if a function is analyzed with path-sensitive analysis but not syntax-only analysis, its `SyntaxRunningTime` will be empty. -- CPP-7099
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