Update `ExpansionPanel` example for the updated `expansionCallback` callback (#132837)
fixes [ExpansionPanelList can't expand/collapse on the latest stable/master ](https://github.com/flutter/flutter/issues/132759) https://github.com/flutter/flutter/pull/128082 updated the `expansionCallback` and also the `ExpansionPanel` sample in the Flutter gallery but not the API example. This PR fixes the API example and adds tests.
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