GW2024 Part 4: Estimation Step

[shtukas]

Previously:

• Part 1: GW2024 Part 1: GW2024 extends MigrationType #1012
• Part 2: GW2024 Part 2: prevent accidental lambda runs #1016
• Part 3: GW2024 Part 3: test fixtures #1018

This is the fourth PR in our series where we are using the GW2024 migration to show how to organise the changes required to build a modern migration.

Here we prepare the Estimation step. For this we do the following

1. The core of the GW2024 Estimation step is the GW2024.priceData function. It's the GW2024 implementation of the more general AmendmentData.priceData. The set of functions we added to GW2024Migration is the smallest set required for this function to return a value.

2. Added tests to cover every function we added in (1.)

3. Plugged in StartDates.lastPriceRiseDate the GW2024 implementation of that function.

4. We opened the Estimation Lambda by removing the lock we had against cohort name "GW2024"

[tomrf1]

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