CDB3-455 CDB3-456 CDB3-653 LLE/LLD/LLP fix test methods names with ru symbols

Summary: plz change ru symbol х to 'x' eng

In next files:

• https://gitlab.prozorro.sale/prozorro-sale/procedure/-/blob/master/test/pytest/legitimatePropertyLease/english/test_rectification.py/test_documents.py

With names:

• х_itemPlan;
• х_ultimateBeneficiaryInfo.