[NFCI][analyzer] Regularize NodeBuilder classes (#180960) This commit removes virtual methods from the `NodeBuilder` class hierarchy (because they were only relevant for the "enclosing builder" feature of `StmtNodeBuilder` which was not used anywhere), then moves the classes `IndirectGotoNodeBuilder` and `SwitchNodeBuilder` into this hierarchy. (Previously they were independent classes with some duplicated logic in the `generateNode()`-like functions.) Updating `SwitchNodeBuilder` is a prerequisite for activating the `BranchCondition` checkers on the condition of the `switch` statement because `CheckerContext` requires the presence of a `NodeBuilder`. Updating `IndirectGotoNodeBuilder` doesn't have any analogous goals -- I'm just doing it for the sake of consistency. I also added some very basic tests because this area wasn't properly covered by the old tests. I'm planning to do more cleanup (e.g. the removal of `StmtNodeBuilder`) in follow-up commits.
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