Add a way to route different issues to different email lists

[yruslan]

Background

Currently, Pramen supports only 2 email lists - one for successes, and one for failures.

Sometimes, depending on an error, for example, emails can be routed to different teams.

This can be part of a pluggable component to decide which email list to send emails to.

This is already supported for other notification types via pipeline notification targets.

Feature

Add a way to route different issues to different email lists.

Example [Optional]

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Proposed Solution [Optional]

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