refactor: remove unused AI provider and related use cases

[Artuomka]

No description provided.

[Copilot]

Pull request overview

This PR removes obsolete AI implementation code, including the old V4 use case that directly used the OpenAI SDK, a simple Amazon Bedrock provider implementation, and unused utility functions. The codebase has evolved to use newer, more maintainable implementations (V5, V6, V7) that leverage the centralized ai-core module with LangChain-based providers.

Changes:

• Removed RequestInfoFromTableWithAIUseCaseV4 (replaced by V5, V6, V7 implementations)
• Removed old AmazonBedrockAiProvider and IAIProvider interface (superseded by LangChain-based providers in ai-core)
• Removed unused pauseCode helper function and getOpenAiTools utility

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
backend/src/helpers/pause-code.ts	Removed unused delay utility function
backend/src/entities/ai/use-cases/use-cases-utils/get-open-ai-tools.util.ts	Removed obsolete OpenAI tools configuration utility
backend/src/entities/ai/use-cases/request-info-from-table-with-ai-v4.use.case.ts	Removed old V4 use case implementation that directly used OpenAI SDK
backend/src/entities/ai/amazon-bedrock/amazon-bedrock.ai.provider.ts	Removed simple Bedrock provider superseded by LangChain-based implementation
backend/src/entities/ai/amazon-bedrock/ai-provider.interface.ts	Removed old provider interface replaced by more comprehensive interface in ai-core

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