Remove disabled "No accounts requested yet..." menu item from accounts menu

[Copilot]

Removes the unnecessary disabled menu item "No accounts requested yet..." that appears at the bottom of the accounts menu on fresh VS Code installations.

Changes Made

• Removed _placeholderMenuItem property that created the disabled menu item
• Removed event handlers that managed adding/removing the placeholder based on authentication provider registration
• Cleaned up now-unused helper methods and empty handlers

Impact

• User Experience: Cleaner accounts menu without confusing disabled items
• Code: Simplified authentication contribution logic by removing 35 lines of placeholder management code
• Compatibility: No breaking changes - all existing authentication functionality remains intact

The disabled menu item provided no value to users and only added visual clutter. Users who need authentication will see the relevant options when extensions or features request authentication providers.

Fixes #228948.

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:

• electronjs.org
  • Triggering command: node-gyp (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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[TylerLeonhardt]

Fix these errors:

[tsec-compile-check ] src/vs/workbench/contrib/authentication/browser/authentication.contribution.ts(6,22): error TS6133: 'IDisposable' is declared but its value is never read.
[tsec-compile-check ] src/vs/workbench/contrib/authentication/browser/authentication.contribution.ts(8,10): error TS6133: 'MenuId' is declared but its value is never read.
[tsec-compile-check ] src/vs/workbench/contrib/authentication/browser/authentication.contribution.ts(8,18): error TS6133: 'MenuRegistry' is declared but its value is never read.
[tsec-compile-check ] src/vs/workbench/contrib/authentication/browser/authentication.contribution.ts(10,1): error TS6133: 'ContextKeyExpr' is declared but its value is never read.
[tsec-compile-check ] src/vs/workbench/contrib/authentication/browser/authentication.contribution.ts(83,55): error TS6138: Property '_authenticationService' is declared but its value is never read.

[Copilot]

Fix these errors:

[tsec-compile-check ] src/vs/workbench/contrib/authentication/browser/authentication.contribution.ts(6,22): error TS6133: 'IDisposable' is declared but its value is never ...

Fixed all TypeScript compilation errors by removing unused imports (IDisposable, MenuId, MenuRegistry, ContextKeyExpr, IAuthenticationService) and the unused _authenticationService property from the constructor. Commit: 9f0d1d6