fix(postgres): make Query Report SQL portable across MariaDB and PostgreSQL

Three Query Reports embedded double-quoted string literals and an unquoted table
identifier that error on PostgreSQL. Portability-only, no behaviour change on either engine:
- material_requests_for_which_supplier_quotations_are_not_created,
  requested_items_to_be_transferred: double-quoted string literals ("Stopped",
  "Material Transfer") -> single quotes (double quotes are identifiers on postgres, not strings).
- items_to_be_requested: quote the `tabBin` table identifier so postgres doesn't lower-case it.

(received_items_to_be_billed was dropped: it is a Script Report, so its `query` field is dead
code and the fix never reaches the DB.)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

erpnext/stock/report/items_to_be_requested/items_to_be_requested.json

@@ -12,7 +12,7 @@
  "module": "Stock", 
  "name": "Items To Be Requested", 
  "owner": "Administrator", 
- "query": "SELECT\n    tabBin.item_code as \"Item:Link/Item:120\",\n    tabBin.warehouse as \"Warehouse:Link/Warehouse:120\",\n    tabBin.actual_qty as \"Actual:Float:90\",\n    tabBin.indented_qty as \"Requested:Float:90\",\n    tabBin.reserved_qty as \"Reserved:Float:90\",\n    tabBin.ordered_qty as \"Ordered:Float:90\",\n    tabBin.projected_qty as \"Projected:Float:90\"\nFROM\n    tabBin, tabItem\nWHERE\n    tabBin.item_code = tabItem.name\n   AND tabBin.projected_qty < 0\nORDER BY\n    tabBin.projected_qty ASC", 
+ "query": "SELECT\n    `tabBin`.item_code as \"Item:Link/Item:120\",\n    `tabBin`.warehouse as \"Warehouse:Link/Warehouse:120\",\n    `tabBin`.actual_qty as \"Actual:Float:90\",\n    `tabBin`.indented_qty as \"Requested:Float:90\",\n    `tabBin`.reserved_qty as \"Reserved:Float:90\",\n    `tabBin`.ordered_qty as \"Ordered:Float:90\",\n    `tabBin`.projected_qty as \"Projected:Float:90\"\nFROM\n    `tabBin`, `tabItem`\nWHERE\n    `tabBin`.item_code = `tabItem`.name\n   AND `tabBin`.projected_qty < 0\nORDER BY\n    `tabBin`.projected_qty ASC", 
  "ref_doctype": "Material Request", 
  "report_name": "Items To Be Requested", 
  "report_type": "Query Report", 

erpnext/stock/report/material_requests_for_which_supplier_quotations_are_not_created/material_requests_for_which_supplier_quotations_are_not_created.json

@@ -12,7 +12,7 @@
  "module": "Stock", 
  "name": "Material Requests for which Supplier Quotations are not created", 
  "owner": "Administrator", 
- "query": "select \n    mr.name as \"Material Request:Link/Material Request:120\",\n    mr.transaction_date as \"Date:Date:100\",\n\tmr_item.item_code as \"Item Code:Link/Item:120\",\n\tmr_item.qty as \"Qty:Float:100\",\n\tmr_item.item_name as \"Item Name::150\",\n\tmr_item.description as \"Description::200\",\n\tmr.company as \"Company:Link/Company:\"\nfrom\n\t`tabMaterial Request` mr, `tabMaterial Request Item` mr_item\nwhere\n\tmr_item.parent = mr.name\n\tand mr.material_request_type = \"Purchase\"\n\tand mr.docstatus = 1\n\tand mr.status != \"Stopped\"\n\tand not exists(select name from `tabSupplier Quotation Item` where material_request=mr.name)\norder by mr.transaction_date asc", 
+ "query": "select \n    mr.name as \"Material Request:Link/Material Request:120\",\n    mr.transaction_date as \"Date:Date:100\",\n\tmr_item.item_code as \"Item Code:Link/Item:120\",\n\tmr_item.qty as \"Qty:Float:100\",\n\tmr_item.item_name as \"Item Name::150\",\n\tmr_item.description as \"Description::200\",\n\tmr.company as \"Company:Link/Company:\"\nfrom\n\t`tabMaterial Request` mr, `tabMaterial Request Item` mr_item\nwhere\n\tmr_item.parent = mr.name\n\tand mr.material_request_type = 'Purchase'\n\tand mr.docstatus = 1\n\tand mr.status != 'Stopped'\n\tand not exists(select name from `tabSupplier Quotation Item` where material_request=mr.name)\norder by mr.transaction_date asc", 
  "ref_doctype": "Material Request", 
  "report_name": "Material Requests for which Supplier Quotations are not created", 
  "report_type": "Query Report", 

erpnext/stock/report/requested_items_to_be_transferred/requested_items_to_be_transferred.json

@@ -12,7 +12,7 @@
  "module": "Stock", 
  "name": "Requested Items To Be Transferred", 
  "owner": "Administrator", 
- "query": "select \n    mr.name as \"Material Request:Link/Material Request:120\",\n\tmr.transaction_date as \"Date:Date:100\",\n\tmr_item.item_code as \"Item Code:Link/Item:120\",\n\tmr_item.qty as \"Qty:Float:100\",\n\tmr_item.ordered_qty as \"Transferred Qty:Float:100\", \n\t(mr_item.qty - ifnull(mr_item.ordered_qty, 0)) as \"Qty to Transfer:Float:100\",\n\tmr_item.item_name as \"Item Name::150\",\n\tmr_item.description as \"Description::200\",\n\tmr.company as \"Company:Link/Company:\"\nfrom\n\t`tabMaterial Request` mr, `tabMaterial Request Item` mr_item\nwhere\n\tmr_item.parent = mr.name\n\tand mr.material_request_type in (\"Material Transfer\", \"Material Issue\")\n\tand mr.docstatus = 1\n\tand mr.status != \"Stopped\"\n\tand ifnull(mr_item.ordered_qty, 0) < ifnull(mr_item.qty, 0)\norder by mr.transaction_date asc", 
+ "query": "select \n    mr.name as \"Material Request:Link/Material Request:120\",\n\tmr.transaction_date as \"Date:Date:100\",\n\tmr_item.item_code as \"Item Code:Link/Item:120\",\n\tmr_item.qty as \"Qty:Float:100\",\n\tmr_item.ordered_qty as \"Transferred Qty:Float:100\", \n\t(mr_item.qty - ifnull(mr_item.ordered_qty, 0)) as \"Qty to Transfer:Float:100\",\n\tmr_item.item_name as \"Item Name::150\",\n\tmr_item.description as \"Description::200\",\n\tmr.company as \"Company:Link/Company:\"\nfrom\n\t`tabMaterial Request` mr, `tabMaterial Request Item` mr_item\nwhere\n\tmr_item.parent = mr.name\n\tand mr.material_request_type in ('Material Transfer', 'Material Issue')\n\tand mr.docstatus = 1\n\tand mr.status != 'Stopped'\n\tand ifnull(mr_item.ordered_qty, 0) < ifnull(mr_item.qty, 0)\norder by mr.transaction_date asc", 
  "ref_doctype": "Stock Entry", 
  "report_name": "Requested Items To Be Transferred", 
  "report_type": "Query Report",