Use pydantic instead of jsonschema for legacy store

Metadata

Project: snapcraft
Number: #5655
Type: issue
State: open
Author: bepri
Labels: Status: Triaged Type: Enhancement
Created: 2025-07-29 17:40:13+00:00
Updated: 2025-08-12 13:24:11+00:00
Closed: —

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Issue body

### What needs to get done The legacy code for parsing the store responses should use Pydantic models instead of validating with the `jsonschema` library. ### Why it needs to get done The current legacy code uses a pinned version of jsonschema that is very difficult to upgrade. Instead of upgrading, the code should just move over to using the more modern pydantic models.

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