[16.0][MIG] contract_price_revision: Migration to 16.0

[houzefa-abba]

Fix views in the process; variation % was not showing inside line list embedded into contract forms.

Test case on runboat

Contract starts in 2024, invoiced every year, first invoice got produced, price = $500:

Run wizard with 10% increase in 2025:

The wizard stops my initial contract line and adds a new one in 2025 with price = $550: