Summary

Part of #18972

This PR makes [enumerate-for-loop if-else-block-instead-of-dict-get (SIM401)'s example error out-of-the-box

Old example

if "bar" in foo:
    value = foo["bar"]
else:
    value = 0

New example

foo = {}
if "bar" in foo:
    value = foo["bar"]
else:
    value = 0

The "Use instead" section was also updated similarly.

The docs for SIM401 also has another section on the preview ternary version, but it does not seem to check that the variable is a dict (bug?) https://play.ruff.rs/c0feada8-a7fe-43f7-b57e-c10520fdcdca

Test Plan

N/A, no functionality/tests affected