Adds create ticket via UI and API walkthrough video to docs
What does this MR do and why?
As part of the release post creation, I recorded a walkthrough video for creating Service Desk tickets from the UI and via the API. Thsi MR adds links to the relevant sections of the Service Desk user documentation.
Contributes to #433376 (closed)
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Screenshots or screen recordings
Docs only
How to set up and validate locally
Docs only