Enable visualizing constructs using code lenses in multi-package directory setups

[madushajg]

Purpose

$title
Addresses: wso2/product-ballerina-integrator#1977

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[Copilot]

Pull Request Overview

This PR enables visualizing constructs using code lenses in multi-package directory setups. The changes focus on improving cross-extension communication between the Ballerina and BI extensions, particularly for workspace scenarios with multiple packages.

• Refactored command registration to ensure core commands are always available for cross-extension calls
• Updated project root initialization to include project info for proper workspace handling
• Added defensive checks and error handling for cross-extension command execution

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
workspaces/bi/bi-extension/src/project-explorer/project-explorer-provider.ts	Added visibility check before revealing items in tree view
workspaces/bi/bi-extension/src/project-explorer/activate.ts	Refactored to register core commands unconditionally for cross-extension availability
workspaces/ballerina/ballerina-visualizer/src/components/TopNavigationBar/index.tsx	Added "welcome" view to breadcrumb skip list
workspaces/ballerina/ballerina-extension/src/views/visualizer/activate.ts	Enhanced workspace handling with project info initialization and document URI tracking
workspaces/ballerina/ballerina-extension/src/views/ai-panel/activate.ts	Removed dead code comment
workspaces/ballerina/ballerina-extension/src/stateMachine.ts	Updated to pass project info with root updates, added BI extension activation check
workspaces/ballerina/ballerina-extension/src/features/test-explorer/activator.ts	Added guard logic to conditionally activate test explorer (contains logic bug)
workspaces/ballerina/ballerina-extension/src/features/bi/activator.ts	Added guard clause to prevent errors when projectPath is undefined

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