[FEATURE] Add "Never Worked" platform history state for regression tests

[Rustix69]

Surfaces tests that have never passed on any platform via a new never_worked property on RegressionTest, a Platform History column on the regression index and by-sample views, and per-platform history detail on the test view page.

Description

Currently the platform only tracks last_passed_on_linux and last_passed_on_windows columns but never surfaces a NULL value meaningfully to users. There is no way to distinguish a test that used to pass but now fails from one that has never passed on any version of CCExtractor.

This PR introduces the "Never Worked" state as described in the project goals:

• Adds a never_worked property to RegressionTest that returns True when both platform columns are NULL
• Adds a Platform History column to the regression test index and by-sample views showing a red "Never Worked" badge or links to the last passing test run per platform

The data already exists in the nullable last_passed_on_linux / last_passed_on_windows columns.

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Snapshot

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud