Overview

Convert the simple date field extractor builtins in vm_builtin_datetime.cpp to use RAII value types. These are all short, uniform functions with the same stack-read pattern.

Scope of Work

• src/mongo/db/exec/sbe/vm/vm_builtin_datetime.cpp — builtinDayOfYear, builtinDayOfMonth, builtinDayOfWeek, builtinYear, builtinMonth, builtinHour, builtinMinute, builtinSecond, builtinMillisecond, builtinWeek, builtinISOWeekYear, builtinISODayOfWeek, builtinISOWeek, builtinTsSecond, builtinTsIncrement, builtinIsTimeUnit, builtinIsDayOfWeek, builtinIsTimezone (~18 functions)

Technical Notes

All these functions use auto [_, tag, val] = getFromStack(N) with no ownership transfer — convert to viewFromStack. Use SERVER-114263 as a model.