refactor(vscode-web): migrate to VS Code CLI with code serve-web

[matifali]

• Replace code-server with official VS Code CLI
• Download CLI from code.visualstudio.com using cli-alpine-* URLs
• Add release_channel variable (stable/insiders)
• Add commit_id variable to pin specific VS Code versions
• Support offline mode with fallback to code-server or cached vscode-server
• Add comprehensive bun tests for settings, extensions, and CLI arguments
• Add Terraform tests for variable validation

[matifali]

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[chatgpt-codex-connector]

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[Copilot]

Pull request overview

This PR refactors the vscode-web module to use the official VS Code CLI instead of code-server, enabling better version control and alignment with official VS Code tooling.

• Migrates from code-server to official VS Code CLI with code serve-web command
• Adds release_channel variable to support stable/insiders releases
• Implements comprehensive offline mode with fallback to code-server or cached vscode-server
• Adds extensive test coverage with 21 new integration tests

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
main.tf	Removes platform variable, adds release_channel and repositions commit_id variable with updated description
run.sh	Complete rewrite to download and use VS Code CLI instead of code-server, with offline fallback mechanisms
main.test.ts	Adds comprehensive test suite with 21 tests covering script generation, settings management, extension installation, and container integration
vscode-web.tftest.hcl	New Terraform validation tests for variable constraints and URL generation
README.md	Updates documentation to reflect VS Code CLI usage and new configuration options