frontend: Change message for Agent with no tools

[tianjing-li]

AI Description

This pull request introduces a new feature to the src/backend/config/default_agent.py and src/interfaces/assistants_web/src/components/MessagingContainer/Welcome.tsx files, enabling users to ask questions and receive answers based on their tools and files.

Changes:

• In src/backend/config/default_agent.py, the description field of the AgentPublic class has been updated to include the phrase "based on your tools and files".
• In src/interfaces/assistants_web/src/components/MessagingContainer/Welcome.tsx, the useAvailableTools hook has been imported and utilized to filter available tools for the base agent.
• The toolToggleMessage variable has been introduced to display a message based on the availability of tools. If no tools are available, the message prompts the user to update their agent to add tools.
• The AssistantTools component now receives the tools array directly, without any filtering.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.21%. Comparing base (f370c46) to head (d43c411).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #877   +/-   ##
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  Coverage   78.21%   78.21%           
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  Files         259      259           
  Lines       11088    11088           
=======================================
  Hits         8672     8672           
  Misses       2416     2416           

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[EugeneLightsOn]

Looks good to me. Thank you TJ