Tutorial: Create Jira credentials

What does this MR do and why?

Builds on !119735 (merged) by:

• Refining the Jira integration docs
• Refactoring Jira Server credentials into a tutorial

Screenshots or screen recordings

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Before	After

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.