Optimize: Enforce input types, and stop appeasing mypy

scripts/mypy-failing.txt

@@ -15,6 +15,7 @@ pytensor/tensor/blas_headers.py
 pytensor/tensor/elemwise.py
 pytensor/tensor/extra_ops.py
 pytensor/tensor/math.py
+pytensor/tensor/optimize.py
 pytensor/tensor/random/basic.py
 pytensor/tensor/random/op.py
 pytensor/tensor/random/utils.py