chore(native): Remove unused variable in VeloxToPrestoExprConverter

[pramodsatya]

Description

Removes unused $static variable from VeloxToPresto expression converter.

Motivation and Context

Cleanup code.

Impact

N/A.

== NO RELEASE NOTE ==

Summary by Sourcery

Chores:

• Clean up an unused static variable definition in the VeloxToPresto expression converter code.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Removes an unused static string constant from the VeloxToPresto expression converter to clean up the native execution codebase.

File-Level Changes

Change	Details	Files
Remove unused static string constant in VeloxToPresto expression converter call-expression handling.	Deleted the unused static constexpr string pointer representing "$static" from the call-expression conversion function. Left the remaining call-expression JSON construction logic unchanged.	presto-native-execution/presto_cpp/main/types/VeloxToPrestoExpr.cpp

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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[aditi-pandit]

Thanks @pramodsatya