Now only the immediately preceding jsdoc of a node is retrieved by
getJSDoc, although it still does the correct non-local lookup for nodes
like ParameterDeclaration.
This doesn't change parsing or binding, which use the per-node Node.jsdoc
property directly. But it does change everything that relies on getJSDoc,
which includes the checker and language service.
Fixes#32062, which contains the analysis that justifies the change.