fix(dashboard): reset connection test modal state in the open handler

[diegosouzapw]

Base-red on the release/v3.8.52 tip: npm run lint fails with 1 error — react-hooks/set-state-in-effect in src/shared/components/ConnectionTestButton.tsx:41 (added by #15138). The loading effect reset loading/error/answer/saved synchronously before fetching.

Fix: those four resets move into the button's onClick (the only place that opens the modal), right before setOpen(true); the effect keeps only the fetch and its async setters. Same visible behavior on every open.

Validation: eslint on the file exit 0; tests/unit/ui/connection-test-message.test.tsx (vitest.config.ts) 9/9 (+1 skipped), same as on the tip.

[github-actions]

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This PR changes production code in src/, open-sse/, electron/, or bin/ without accompanying automated tests.