Configurable email address for service desk

~~- Exclusive ~"EE Premium" feature only~~

Description

• Service desk has a static email address.
• The email address should be configurable, up to the domain, i.e. configure-this@gitlab-instance-domain.com, or maybe something more restrictive like configure-this+project-name@gitlab-instance-domain.com.
• There should be restrictions (and UI validations) on what is configurable. For example, it should not be the same as the email address when users reply to notifications.
• You cannot use something that is already being used in another project.

UPDATE:

based on discussions (#2201 (comment 267669261)) only limited customization is possible now:

• instance wide configuration of separate service desk address
• per-project configuration of email suffix https://docs.gitlab.com/ee/user/project/service_desk.html#using-custom-email-address

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