[torreypayne]

Retires the broken predict_text_prompt sample under google-cloud-ai_platform/samples/ and removes its entries from librarian.yaml.

The sample targets the retired text-bison@001 model, and Gemini is not available via PredictionService.

Verified with toys test and toys rubocop on google-cloud-ai_platform across Ruby 3.2, 3.3, and 4.0.

Fixes b/418022526.

[snippet-bot]

Here is the summary of changes.

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• google-cloud-ai_platform/samples/predict_text_prompt.rb:15, tag aiplatform_sdk_ideation

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