[Partner Nodes] chore(Google): remove preview versions of models that will be deprecated soon

[bigcat88]

These models will be completely removed from VertexAI at July 9, 2026

API Node PR Checklist

Scope

• Is API Node Change

Pricing & Billing

• Need pricing update
• No pricing update

If Need pricing update:

• Metronome rate cards updated
• Auto‑billing tests updated and passing

QA

• QA done
• QA not required

Comms

• Informed Kosinkadink

[coderabbitai]

📝 Walkthrough

Walkthrough

The changes in comfy_api_nodes/nodes_gemini.py remove the GeminiImageModel enum and its Enum import. The GeminiNode legacy text node's model selector drops two preview variants (gemini-2.5-pro-preview-05-06 and gemini-2.5-flash-preview-04-17). The GeminiImageNode schema replaces the now-deleted enum-based options with an explicit list containing only "gemini-2.5-flash-image". The calculate_tokens_price function's Gemini 2.5 pricing logic is rewritten from set-membership checks (covering multiple preview/stable strings) to direct == comparisons for each specific model version string.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main change: removing preview versions of Google models that will be deprecated, which directly corresponds to the changeset.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The PR description clearly relates to the changeset: removing preview model variants from Gemini model handling due to VertexAI deprecation on July 9, 2026.

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