OCA Responses support: don't change anything but oca

[ChaiEranki]

Description

This PR adds Responses API support for the OCA provider. To do this, we changed the following:

• We added 4 new variables to the OcaModelInfo storing reasoning effort information and also responses API vs chat completions API support -> supports_chat_api, supports_responses_api, supports_reasoning, reasoning_effort_options
• We added an overall parameter to store the selected reasoningEffort parameter and propagate it -> ocaReasoningEffort
• A reasoning effort selection dropdown was added under the model selection dropdown only for the OCA provider
• Added Oracle Code Assist to nextGenModelProvider list so that it uses GPT 5 specific prompts

Test Procedure

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• ♻️ Refactor Changes
• 💅 Cosmetic Changes
• 📚 Documentation update
• 🏃 Workflow Changes

Pre-flight Checklist

• Changes are limited to a single feature, bugfix or chore (split larger changes into separate PRs)
• Tests are passing (npm test) and code is formatted and linted (npm run format && npm run lint)
• I have created a changeset using npm run changeset (required for user-facing changes)
• I have reviewed contributor guidelines

Screenshots

Additional Notes