ProxyTorchDispatchMode: Decomposing missing sympy.SymExpr should handle constant literals

[aorenste]

The previous work to decompose missing sympy.SymExpr (#164717) handled combinations of sub-nodes (like s1*s2) but I forgot to handle explicit literals (like 2*s2).

Added a unit test based on the report.

Fixes T244632748

Stack from ghstack (oldest at bottom):

• -> ProxyTorchDispatchMode: Decomposing missing sympy.SymExpr should handle constant literals #167585

cc @ezyang @EikanWang @jgong5 @wenzhe-nrv

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✅ You can merge normally! (1 Unrelated Failure)

As of commit b8b966c with merge base 5b6ff81 ():

UNSTABLE - The following job is marked as unstable, possibly due to flakiness on trunk:

• trunk / linux-jammy-py3-clang12-executorch / test (executorch, 1, 1, lf.linux.2xlarge, unstable) (gh) (#166072)
  backends/xnnpack/test/recipes/test_xnnpack_recipes.py::TestXnnpackRecipes::test_int8_static_quant_recipe

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[aorenste]

@pytorchbot merge

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