Fix Vector2 and Vector3 comparison reductions

[tannergooding]

Vector2 and Vector3 strict Any comparisons incorrectly returned true when no logical lanes matched because zero-filled padding lanes matched zero entries in the validity mask. Use the direct Vector128 comparison reductions, which the JIT expands to the canonical comparison forms, and simplify the inclusive All reductions similarly.

Add coverage for padding-sensitive outcomes and NaN in every valid lane.

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What changed in this PR

This PR corrects Vector2/Vector3 strict GreaterThanAny/LessThanAny reductions to avoid false positives caused by comparing a full Vector128 result against a mask that includes zero padding lanes. It switches to the dedicated Vector128.*Any/*All reduction helpers and adds regression tests to ensure padding lanes and NaN behavior don’t corrupt results.

Changes:

• Fix Vector2/Vector3 strict GreaterThanAny and LessThanAny to use Vector128.GreaterThanAny / Vector128.LessThanAny.
• Simplify inclusive GreaterThanOrEqualAll / LessThanOrEqualAll to use Vector128.*All reductions directly.
• Add/extend unit tests to cover padding-lane-sensitive false positives and NaN behavior for inclusive All.

File	Description
src/​libraries/​System.Private.CoreLib/​src/​System/​Numerics/​Vector3.cs	Uses Vector128.*Any/*All reduction helpers to avoid padding-lane false positives.
src/​libraries/​System.Private.CoreLib/​src/​System/​Numerics/​Vector2.cs	Same reduction change for Vector2 comparisons.
src/​libraries/​System.Numerics.Vectors/​tests/​Vector3Tests.cs	Adds regression coverage for strict Any and extends inclusive All tests with padding/NaN cases.
src/​libraries/​System.Numerics.Vectors/​tests/​Vector2Tests.cs	Adds regression coverage for strict Any and extends inclusive All tests with padding/NaN cases.