Consolidate duplicate test cases

[Snuffy2]

Summary

Simplifies the test suite by removing redundant one-off tests and folding duplicated scenarios into existing parameterized coverage. This keeps behavior coverage intact while reducing test maintenance noise.

What Changed

• Removed duplicate tests already covered by parameterized cases in sensor, tracker, update sensor, integration, config flow, display option, parse OSM, persistence, and OSM client tests.
• Added missing parameter rows where one-off edge cases had useful assertions, including GPS accuracy, nonnumeric coordinates, legacy persistence failure modes, cached OSM payload shapes, tracker state variants, and city-clean normalization.
• Preserved specific regression assertions while consolidating repeated setup and duplicated test bodies.

Why

The suite had several AI-generated cleanup candidates: standalone tests that repeated the same setup and behavior already covered elsewhere, plus adjacent tests differing only by one input value.

Parameterizing those cases keeps the coverage explicit while making the suite easier to scan and maintain.

[github-actions]

Coverage report

This PR does not seem to contain any modification to coverable code.