* fix(stock): recompute moving average item slots
* test(stock): add test to validate the stock value of moving average items
* fix(stock): support lifo valuation in stock ageing report
lifo items were aged as fifo (oldest consumed first), so the report kept the
newest lots on hand and reported the wrong stock value and average age. prefetch
each item's valuation method (it can't be resolved mid-stream without breaking the
unbuffered cursor) and consume from the tail for lifo items. also reuse that shared
lookup in the moving average revaluation pass. scoped to plain items; batch, serial
and same-voucher repack legs stay on fifo.
* test(stock): add test for lifo consumption in stock ageing report
(cherry picked from commit 9cb6610b9e)
# Conflicts:
# erpnext/stock/report/stock_ageing/stock_ageing.py
02549ef8c4