Add gemini-2.5-pro to model list

[tgmerritt]

Description

Added gemini-2.5-pro to the model list

Testing instructions

Add gemini-2.5-pro to your model list Select it from the drop down in the Continue chat tray Make a model request (you will need Pro access which requires a paid subscription)

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[tgmerritt]

Google's API is currently saying model not found, but this was announced only a few hours ago by them, so we expect it will be added shortly to their model availability list.

[RomneyDa]

@tgmerritt looks like I broke the json when trying to quick fix merge conflicts. taking another look now