fix(@schematics/angular): add MCP configuration file to new workspaces

[alessiopelliccione]

Closes #31888
Changes:

• Add .vscode/mcp.json template with angular-cli MCP server configuration
• Update .gitignore template to whitelist .vscode/mcp.json
• Update workspace schematic tests to expect mcp.json file

PR Checklist

Please check to confirm your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/angular/angular-cli/blob/main/CONTRIBUTING.md#-commit-message-guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

When using ng new, it does not create any mcp.json files.

Issue Number: #31888

What is the new behavior?

When using ng new, it now creates an mcp.json file including Angular MCP.

Does this PR introduce a breaking change?

• Yes
• No

Other information

I included the Angular MCP by default.

[alan-agius4]

LGTM, thanks

[alan-agius4]

This PR was merged into the repository. The changes were merged into the following branches:

• main: 18cf6c5
• 21.0.x: 7a52e3c