Improve rendering of HTML-only emails in issue responses
What does this MR do and why?
As part of the feature flag rollout this MR removes the feature flag service_desk_html_to_text_email_handler
and makes #372301 (closed) generally available.
This feature flag was globally enabled on <code data-sourcepos="5:48-5:57">production</code> since 2023-03-15
without issues.
The new parser was initially added back in !109811 (merged).
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #389822
Edited by Peter Leitzen