chore(compass-assistant): add disclaimer, loading and welcome text COMPASS-9754

[gagik]

Adds the disclaimer and welcome text to the Assistant chat.

[Copilot]

Pull Request Overview

This PR adds disclaimer text and welcome messaging to the MongoDB Compass Assistant chat interface, along with infrastructure for proactive performance insights integration with Assistant entry points.

• Adds disclaimer text and FAQ link to the Assistant chat interface with welcome messaging for first-time users
• Integrates "Tell me more" buttons in performance insight signals that trigger Assistant entry points with contextual prompts
• Refactors prompt building system to support multiple entry point types with standardized message formatting

Reviewed Changes

Copilot reviewed 17 out of 18 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/compass-assistant/src/assistant-chat.tsx	Adds disclaimer text, FAQ link, and welcome message to chat interface
packages/compass-assistant/src/prompts.ts	Refactors and expands prompt building system for multiple entry point types
packages/compass-assistant/src/compass-assistant-provider.tsx	Refactors assistant actions to use unified entry point handler pattern
packages/compass-components/src/components/signal-popover.tsx	Adds "Tell me more" button functionality to insight signals
packages/compass-crud/src/components/document-list.tsx	Integrates Assistant actions with query performance insights
packages/compass-aggregations/src/components/pipeline-toolbar/pipeline-header/pipeline-actions.tsx	Integrates Assistant actions with aggregation performance insights
packages/compass-e2e-tests/tests/connection.test.ts	Updates test expectation for connection error prompt text

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