[VS Code] (single-account): Pre-select active account in the "select workspace account" menu

Problem to solve

When you choose the GitLab: Select Account for this Workspace and you see the quick pick, the top (highlighted) account is not necessarily the currently active account.

See the screencast for a visual illustration

wrong-account-selection

Proposal

Ensure that the top (highlighted) account is the active account.

Further details

This means re-order the offered accounts in https://gitlab.com/gitlab-org/gitlab-vscode-extension/blob/7f0ccf93e3d09c9d9220949a44462f36c8b725df/src/desktop/accounts/select_workspace_account_command.ts#L19 to ensure the active account is first

Links / references

/cc @dashaadu @tvanderhelm