Add issue description to txt/plain emails
What does this MR do?
Adds issue description to new_issue mail when in text/plain content-type
Are there points in the code the reviewer needs to double check?
Why was this MR needed?
Because clients that are rendering emails in text mode can see issue description
What are the relevant issue numbers?
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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CHANGELOG entry added -
Documentation created/updated -
API support added - Tests
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Added for this feature/bug -
All builds are passing
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Conform by the style guides -
Branch has no merge conflicts with master
(if you do - rebase it please) -
Squashed related commits together