…n batch billed on ordered qty

**Problem:**
When the picking of a purchase order (of a product billed on ordered quantity) is split into different
moves and put in a batch, at batch validation, svls are created with the wrong values.

 **Steps to reproduce:**
    - enable "Batch, Wave & Cluster Transfers" settings
    - create a storable product with a standard price of 1
    - set the category as avco
    - in the Purchase tab select the control policy as
    "on ordered quantities"
    - create and confirm a purchase order for 50 of this product
    - on the Receipt, change the quantity to 20 and split the
    picking
    - go back the the PO and create and confirm a bill for
    the full amount
    - click on the receipt smart button
    - select the two pickings and then the 'Action' button
    - select add to batch
    - check 'new batch transfer' and confirm
    - open the batch and validate it
    - open stock valuation
    
**Current behavior:**
    the newly created svls have total values of
    50 and 50.10

**Expected behavior:**
    it should be 20 and 30
    
**Cause of the issue:**
When the batch is validated, _action_done is called 
on the two stock moves.
https://github.com/odoo/odoo/blob/dc57ea4d306f8745d37f2c5d2c3d3fa4bcaf7253/addons/stock/models/stock_picking.py#L1258
In the stock_account override: 
- first the super method is called
As a consequence the state of the two moves becomes 'done'
and the qty_received of the linked purchase order line becomes 50.
- then product_price_update_before_done is called before creating
the svls.

Inside product_price_update_before_done we call _get_price_unit.
In the purchase_stock override of _get_price_unit : 
- because the super method of action_done was already called, 
qty_received of the purchase order line is 50, so _get_qty_received_without_self
will return 30. 
https://github.com/odoo/odoo/blob/dc57ea4d306f8745d37f2c5d2c3d3fa4bcaf7253/addons/purchase_stock/models/stock_move.py#L50
So received_qty is 30 and later remaining_qty will be 20
https://github.com/odoo/odoo/blob/dc57ea4d306f8745d37f2c5d2c3d3fa4bcaf7253/addons/purchase_stock/models/stock_move.py#L86
- but because no svl was created yet receipt_value will stay 0 and later 
remaining_value will be 50
https://github.com/odoo/odoo/blob/dc57ea4d306f8745d37f2c5d2c3d3fa4bcaf7253/addons/purchase_stock/models/stock_move.py#L55-L63
Therefore price_unit will be 2.5 (50/20) instead of 1 

**fix**
We do not take into account the move(s) of the 
same batch in the remaining value (because svls are not created yet)
so we should not  take them into account in the remaining quantity.

opw-5179581

## Issue:
After confirming a Sale Order for a lot-tracked product (in grams for example) and having available quantities, importing the SO in POS duplicates the order lines

## Cause:
In the `settleSO` function, the line is first split because the UoM differs and is not `pos_groupable`
Among the default UoMs, only Units, Pack of 6, and Dozen have `is_pos_groupable` = True, meaning most other UoMs will trigger a line split

After duplicating the line due to the UoM split, an additional line is then added for each lot to link, causing duplicate entries in the POS order

## Steps to reproduce:
- In Settings, enable Lots & Serial Numbers and Units of Measure & Packagings
- Create a Product (Tracking: Lot, Sale Unit: g)
- Update the Quantity On Hand (Lot: "LOT", Quantity: 5)
- Create and confirm a Sale Order for the product (Quantity: 2)
- Open POS and import the SO
- Before the fix, there is 3 lines (2x no lots, 1x with lot + qty 2

## Other issues:
- The discount was not imported on the lot lines
- Some lines were missing when importing lines where part of the quantity had no available lot
- (This fix was already made in PR: https://github.com/odoo/odoo/pull/229075/files but was not forward-ported)

opw-5018295