fix(native): Fix a flaky test in FunctionMetadataTest

[xin-zhang2]

Description

This PR fixes a flaky test FunctionMetadataTest.mod(#26527).

presto-native-execution/presto_cpp/main/functions/tests/FunctionMetadataTest.cpp:74: Failure
Expected equality of these values:
   expectedList[i]
     Which is: {"docString":"presto.default.mod","functionKind":"SCALAR","longVariableConstraints":[{"expression":"max(i5, i6)","name":"i7"},{"expression":"min(i2 - i6, i1 - i5) + max(i5, i6)","name":"i3"}],"outputType":"decimal(i3,i7)","paramTypes":["decimal(i1,i5)","decimal(i2,i6)"],"routineCharacteristics":{"determinism":"DETERMINISTIC","language":"CPP","nullCallClause":"RETURNS_NULL_ON_NULL_INPUT"},"schema":"default","typeVariableConstraints":[],"variableArity":false}
   metadataList[i]
     Which is: {"docString":"presto.default.mod","functionKind":"SCALAR","longVariableConstraints":[{"expression":"min(i2 - i6, i1 - i5) + max(i5, i6)","name":"i3"},{"expression":"max(i5, i6)","name":"i7"}],"outputType":"decimal(i3,i7)","paramTypes":["decimal(i1,i5)","decimal(i2,i6)"],"routineCharacteristics":{"determinism":"DETERMINISTIC","language":"CPP","nullCallClause":"RETURNS_NULL_ON_NULL_INPUT"},"schema":"default","typeVariableConstraints":[],"variableArity":false}
 Position: 1

longVariableConstraints is built in getLongVariableConstraints, and its element order depends on the iterating of functionSignature.variables(), which is an unordered_map and therefore not guaranteed.
This PR adds a sort operation before the result comparison.

Motivation and Context

Impact

Test Plan

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Ensure deterministic ordering of nested variable constraints in FunctionMetadataTest by sorting JSON sub-arrays before comparison, eliminating flakiness due to unordered_map iteration.

File-Level Changes

Change	Details	Files
Introduce deterministic sorting of nested variable constraint arrays in the test	Add sortVariableConstraints lambda to sort 'longVariableConstraints' and 'typeVariableConstraints' by their 'name' field Call sortVariableConstraints on both expectedList[i] and metadataList[i] before each EXPECT_EQ assertion	presto-native-execution/presto_cpp/main/functions/tests/FunctionMetadataTest.cpp

Possibly linked issues

• #unknown: The PR fixes the flaky FunctionMetadataTest.mod by adding a sort operation for longVariableConstraints as described in the issue.
• Add release notes for 0.217 #12345: The PR adds a sort operation for longVariableConstraints to fix the flaky FunctionMetadataTest.mod caused by unordered map iteration.

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[xin-zhang2]

Close as duplicate of #26441.