AI Templates - Fixes for Ollama and OpenAI scenarios

[jmatthiesen]

Fixes several issues for the different combinations of environment choices:

• Fixed Azure AI Search integration by adding a check in the data ingestor to see if there are documents to delete before trying to delete them.
• Adjusted the main chat prompt so that citations work with Ollama/Llama3.2 after recent changes - verified it works for all other supported AI model providers
• Fixed using statements when pairing OpenAI with Azure AI Search (was missing a using Azure statement)
• Removed the Attach Media button after a recent decision to not include that for now.
• Fixed the conditionals in Chat.razor to include the proper code for Ollama.

Microsoft Reviewers: Open in CodeFlow

[dotnet-comment-bot]

‼️ Found issues ‼️

Project	Coverage Type	Expected	Actual
Microsoft.Extensions.AI.Ollama	Line	80	78.25 🔻
Microsoft.Extensions.Caching.Hybrid	Line	86	82.85 🔻
Microsoft.Gen.MetadataExtractor	Line	98	57.35 🔻
Microsoft.Gen.MetadataExtractor	Branch	98	62.5 🔻

🎉 Good job! The coverage increased 🎉
Update MinCodeCoverage in the project files.

Project	Expected	Actual
Microsoft.Extensions.AI	88	89
Microsoft.Extensions.AI.OpenAI	77	78
Microsoft.Extensions.AI.Abstractions	83	84

Full code coverage report: https://dev.azure.com/dnceng-public/public/_build/results?buildId=943766&view=codecoverage-tab

[dotnet-comment-bot]

‼️ Found issues ‼️

Project	Coverage Type	Expected	Actual
Microsoft.Extensions.Caching.Hybrid	Line	86	82.77 🔻
Microsoft.Gen.MetadataExtractor	Line	98	57.35 🔻
Microsoft.Gen.MetadataExtractor	Branch	98	62.5 🔻
Microsoft.Extensions.AI.Ollama	Line	80	78.25 🔻

🎉 Good job! The coverage increased 🎉
Update MinCodeCoverage in the project files.

Project	Expected	Actual
Microsoft.Extensions.AI.Abstractions	83	84
Microsoft.Extensions.AI	88	89
Microsoft.Extensions.AI.OpenAI	77	78

Full code coverage report: https://dev.azure.com/dnceng-public/public/_build/results?buildId=944406&view=codecoverage-tab

[dotnet-comment-bot]

‼️ Found issues ‼️

Project	Coverage Type	Expected	Actual
Microsoft.Extensions.AI.Ollama	Line	80	78.11 🔻
Microsoft.Gen.MetadataExtractor	Line	98	57.35 🔻
Microsoft.Gen.MetadataExtractor	Branch	98	62.5 🔻
Microsoft.Extensions.Caching.Hybrid	Line	86	82.77 🔻

🎉 Good job! The coverage increased 🎉
Update MinCodeCoverage in the project files.

Project	Expected	Actual
Microsoft.Extensions.AI.AzureAIInference	91	92
Microsoft.Extensions.AI	88	89
Microsoft.Extensions.AI.Abstractions	83	85

Full code coverage report: https://dev.azure.com/dnceng-public/public/_build/results?buildId=944923&view=codecoverage-tab