Contacts Group "Send email" & "Send email as BCC" is not usable

Describe the bug

When you select "Send email" & "Send email as BCC" on a contact group your default mail client, Outlook or Thunderbird, the addresses are populated in a way that the mail client can not understand. This makes the feature useless.

Steps to reproduce

1. Select menus on left of contact group
2. Click on 'Send email'
3. TO: field populated with Email Address 1 <email.address1@test.com>,Email Adress 2 <email.abress2@test.com>,Email Address 3<email.address3@test.com>

Expected behavior

For the email client to accept the data it needs to be populated as below.

email.address1@test.com; email.abress2@test.com; email.address3@test.com

Actual behavior

TO: field populated with Email Address 1 <email.address1@test.com>,Email Adress 2 <email.abress2@test.com>,Email Address 3<email.address3@test.com>

Contact version

1.11

Operating system

Ubuntu 22.04.5 LTS

PHP engine version

PHP 8.2

Web server

Apache (supported)

Database

MariaDB

Additional info

This has been an issue for as long as I can remember and I've finally decided to raise it. Should be an easy fix.

Start by reproducing the contact group's left-side menu actions for “Send email” and “Send email as BCC” with Outlook or Thunderbird, then trace where the recipient list is assembled. Verify that the generated TO field uses the semicolon-separated email format shown in the expected behavior for multiple contacts.