Fix unchecked type in ManipulateNames (#1726)

Fix a bug where a type check would always yield true. This caused a
bug where allow/block-list annotations would be incorrectly applied to
all subtypes of ManipulateNames.

The tests are updated to check that this now works.

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@ibm.com>

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>