[IMP] stock and mrp : Usability improvements

**Description of the issue/feature this PR addresses**:
- Task: https://www.odoo.com/web#id=1943397&action=333&active_id=131&model=project.task&view_type=form&menu_id=4720
- Pad: https://pad.odoo.com/p/r.018c7fbae8a5a0757b9b1cc5ce2b1d01

**Description:**
- Removed "Assembly station 1" from everywhere and replaced it with "Assemmbly Line 1". Renamed "Assembly station 2" to "Assembly Line 2".
- operations field on BOM will be hidden when advanced routes are not active.
- Hide sequence field in form view in BOM and added a widget handle in list view.
- Hide field "Manufacturing readiness" in MO when WO aren't active.
- Added a domain in PLM in Lot/Serial Numbers to show only variants of the product.
- Removed red and green colors from Traceability Report.
- Renamed "Cost" to "Value" on products.
- Changed tooltip of "weight for shipping" in shipping information in inventory.

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I confirm I have signed the CLA and read the PR guidelines at www.odoo.com/submit-pr

closes odoo/odoo#31594

Signed-off-by: Simon Lejeune (sle) <sle@openerp.com>

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