Since this caused bad performance (as we had to evaluate points-to).
Fixes https://github.com/github/codeql/issues/6964
This approach was motivated by the comment on the issue from @tausbn:
> We discussed this internally in the CodeQL Python team, and have
> agreed that the best approach for now is to disable the printing of
> regex ASTs.
I tried to keep our RegExpTerm logic, but doing the fix below did not
work, and still evaluated RegExpTerm :| I guess we will just have to
revert this PR if we want it back
```diff
TRegExpTermNode(RegExpTerm term) {
+ none() and
exists(StrConst str | term.getRootTerm() = getParsedRegExp(str) and shouldPrint(str, _))
}
```
