Fix ReshapeFusion shape-input traversal

[Igor Stadnyk (fallenmi)]

Description

Fixes #32105.

• require a contiguous Reshape/Squeeze/Unsqueeze chain to feed downstream data input 0
• leave Reshape shape inputs and Squeeze/Unsqueeze axes inputs outside the data-path fusion
• add an in-memory opset 21 regression that initializes and executes baseline and optimized sessions

Motivation and Context

FuseContiguousReshapes followed a node's sole output consumer without checking the destination input slot. When a Reshape output supplied input 1 (shape) of another Reshape, the optimizer treated that int64 shape path as a float data path and created a type-invalid _new_reshape.

The regression intentionally removes the issue reproducer's irrelevant Cast while preserving the faulty int64 shape-edge relationship. It fails on main during target session initialization with the reported tensor(float) versus tensor(int64) error.

Validation

• RED on main: the new test fails at InferenceSession::Initialize() with the reported type mismatch
• new regression: 25 repeated passes after the fix
• GraphTransformationTests.ReshapeFusion*: 23/23 passed
• onnxruntime_test_all: 1,937 passed, 17 skipped (1,954 total)
• lintrunner --all-files
• git diff --check
• macOS arm64 Release CPU build with vendored dependencies

AI assistance disclosure: OpenAI Codex helped investigate and draft this change; I reproduced the bug, reviewed the patch, and ran the validation listed above.

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