Fix Power Pages Generator context menu commands not working after installation

[Copilot]

Problem

Users reported that after seeing the success message "The Power Pages generator is ready for use in your VS Code extension!", the Power Pages context menu commands (Create Web Page, Create Web File, etc.) would appear but do nothing when clicked.

The issue occurred because:

1. GeneratorAcquisition.ensureInstalled() would show a success message after npm install completed
2. However, it could still return null if the yo binary wasn't immediately available
3. This caused initializeGenerator() to skip registering commands and setting the powerPlatform.generatorInstalled config
4. Context menu appeared (based on powerpages.websiteYmlExists) but commands remained disabled (based on config.powerPlatform.generatorInstalled)

Solution

Enhanced installation verification:

• Modified ensureInstalled() to verify the yo command is actually available after npm install
• Success message is only shown when the yo binary can be found
• Added clear error messaging when installation succeeds but binary is unavailable

Improved initialization flow:

• Fixed initializeGenerator() to use the return value from ensureInstalled() directly
• Added comprehensive logging for debugging installation and path resolution issues

Before (buggy behavior):

npm install succeeds → Shows "generator ready" → Returns null → Commands disabled

After (fixed behavior):

npm install succeeds → Verifies yo available → Shows "generator ready" → Commands enabled
npm install succeeds → yo not available → Shows error message → Commands not registered

Testing

Created comprehensive test scenarios that verify:

• ✅ Success case: Commands are registered and config is set only when yo binary is available
• ✅ Failure case: Appropriate error messages are shown when installation succeeds but binary is missing
• ✅ No false success messages that would confuse users

This ensures users only see the success message when the Power Pages generator commands will actually work.

Fixes #1218.

[!WARNING]

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• update.code.visualstudio.com
  • Triggering command: gulp testDesktopInt (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

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