node -> gmailBackupSearch used? should port it

[tomholub]

part of #1051

This is the complete implementation

export const gmailBackupSearchQuery = (acctEmail: string) => {
  return [
    'from:' + acctEmail,
    'to:' + acctEmail,
    '(subject:"' + GMAIL_RECOVERY_EMAIL_SUBJECTS.join('" OR subject: "') + '")',
    '-is:spam',
  ].join(' ');
};

if not used, then please close.