fix: Update floor division schema replacement in lowering

[gs-olive]

Description

• Lowering can occasionally replace the aten::floor_divide inputs with integers or floats, for which the correct function name is aten::floordiv, which ultimately throws an unknown schema error
• Fix RemoveSingleUse0DTensors lowering pass to repair schema when replacing intermediate operation including an aten::floor_divide call
• Add test cases to ensure that the resulting graph is schematically correct, but also numerically accurate

Error thrown:

RuntimeError: 
Schema not found for node. File a bug report.
Node: %25626 : int = aten::floor_divide(%22918, %25625)

Input types:int, int
candidates were:
  aten::floor_divide(Tensor self, Tensor other) -> Tensor
  aten::floor_divide.Scalar(Tensor self, Scalar other) -> Tensor
  aten::floor_divide.out(Tensor self, Tensor other, *, Tensor(a!) out) -> Tensor(a!)

Preceding Lowering Optimizations:

GRAPH: [Torch-TensorRT - Debug Build] - Found a 0D Tensor: 234
GRAPH: [Torch-TensorRT - Debug Build] - Number of uses: 1
GRAPH: [Torch-TensorRT - Debug Build] - Downstream user is aten::Int/aten::Float
GRAPH: [Torch-TensorRT - Debug Build] - Input 0 is a Tensor
GRAPH: [Torch-TensorRT - Debug Build] - Found a prim::NumToTensor / aten::[Int/Float] pair with an intermediate operation:
    %234 : Tensor = prim::Constant[value={8}]()
   %22919 : Tensor = prim::NumToTensor(%22918)
   %22920 : Tensor = aten::floor_divide(%22919, %234)
   %22921 : int = aten::Int(%22920)

GRAPH: [Torch-TensorRT - Debug Build] - Deleting 0-dim Tensor: %234 : Tensor = prim::Constant[value={8}]()
GRAPH: [Torch-TensorRT - Debug Build] - New constant: %25625 : int = prim::Constant[value=8]()
GRAPH: [Torch-TensorRT - Debug Build] - Deleting NumToTensor: %22919 : Tensor = prim::NumToTensor(%22918) 
GRAPH: [Torch-TensorRT - Debug Build] - aten::floor_divide(Tensor self, Tensor other) -> Tensor
GRAPH: [Torch-TensorRT - Debug Build] - New intermediate operation: %25626 : int = aten::floor_divide(%22918, %25625)

Fixes #1462

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• [ x ] My code follows the style guidelines of this project (You can use the linters)
• [ x ] I have performed a self-review of my own code
• [ x ] I have commented my code, particularly in hard-to-understand areas and hacks
• [ x ] I have made corresponding changes to the documentation
• [ x ] I have added tests to verify my fix or my feature
• [ x ] New and existing unit tests pass locally with my changes
• [ x ] I have added the relevant labels to my PR in so that relevant reviewers are notified

[narendasan]

LGTM