feat: launch Gemini 3 Flash in Gemini CLI ⚡️⚡️⚡️ #15195

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@scidomino

The following contributors were found for this pull request:

✅ 4bdf85f Committer: @scidomino <sc*****no@gmail.com>
✅ d4f1da3 Author: @joshualitt <jos*****tt@google.com>
✅ faf69f2 Author: @abhipatel12 <ab*****el@google.com>
✅ 4292c87 Author: @adamfweidman <ada******man@google.com>, <65992621+adamfweidman@users.noreply.github.com>
✅ ae5068b Author: @sehoon38 <s***n@google.com>
✅ 86a7778 Author: @Adib234 <30782825+Adib234@users.noreply.github.com>
✅ 4bdf85f Author: @jkcinouye <ji****e@google.com>

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