Edit childcare programs' interactions and edit is_parent variable

[vahid-ahmadi]

Edit the logic of childcare programs:

1. Corrected the is_parent variable to properly identify parents.
2. Fixed the logic in childcare programs by adding interaction between childcare program conditions to ensure accurate calculations.

Fixes #1089
Fixes #1101

[nikhilwoodruff]

The title of this PR is too vague- please always title PRs so that people know what they're doing without having to look at the code or PR body.

[nikhilwoodruff]

We also need to add max_free_entitlement_hours_used which we'll fill from the data- default to 30.

[vahid-ahmadi]

We also need to add max_free_entitlement_hours_used which we'll fill from the data- default to 30.

Done. But I didn't specify it to any childcare program. I created a general max free entitlement hours variable.

[nikhilwoodruff]

Thanks- could you add a few tests for the max hours used?