fix: don't ask user to select account

Description

This fixes an issue where the feature flag service showed an account picker often.

Without this MR, if you have two or more accounts, you'll see this immediately after the start and then during every sidebar refresh

Related Issues

Resolves Select GitLab Account pop-op constantly opens (#1513 - closed)

How has this been tested?

1. Add two accounts to the VS Code
2. see that account picker doesn't show right after the start

Screenshots (if appropriate)

What CHANGELOG entry will this MR create?

• fix: Bug fix fixes - a user-facing issue in production - included in changelog
• feature: New feature - a user-facing change which adds functionality - included in changelog
• BREAKING CHANGE: (fix or feature that would cause existing functionality to change) - should bump major version, mentioned in the changelog
• None - other non-user-facing changes