python: rewrite type tracker for compiled regexes
python: rewrite type tracker for compiled regexes

we have the option to use `regex.getAValueReachingSink`
rather than `regex.asSink`, but it will likely be used as a
sink for data flow.

github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql