fix: Remove faulty token validation for symbol upload

[bitsandfoxes]

The DebugSymbolsTab disables the org slug field when it detects an org auth token via StartsWith("sntrys_"). But token validation and org extraction in sentry-cli consists of three different parts, checking for StartsWith("sntrys_") just being one of them.

This means a token can pass the prefix check yet still fail sentry-cli's own parsing — leaving the user with a disabled org field and no way to provide the org slug as a fallback.

This removes the IsOrgAuthToken() prefix check and the special handling around the org field: no more disabling it, no more info help box, no more error icon. The wizard will still only fill the auth token since it reliably fetches the correct one. But the SDK will no longer hinder users from filling the org field as a fallback.

[github-actions]

Semver Impact of This PR

🟢 Patch (bug fixes)

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Bug Fixes 🐛

• Remove faulty token validation for symbol upload by bitsandfoxes in #2537

Internal Changes 🔧

• (deps) Update Cocoa SDK to v9.4.1 by github-actions in #2540

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[cursor]

Org Slug error icon removed instead of simplified

Medium Severity

The Org Slug field's GUIContent lost its ErrorIcon argument entirely. The Auth Token and Project Name fields both still show SentryWindow.ErrorIcon when UploadSymbols is enabled and the value is empty, but the Org Slug field no longer does. The old code conditionally showed the icon via !isOrgAuthToken; removing the org-auth-token logic means the condition simplifies to cliOptions.UploadSymbols && string.IsNullOrWhiteSpace(cliOptions.Organization), but instead the whole icon expression was dropped.