GitLab for Jira Cloud app - Add link to Youtube video

What does this MR do?

Back in June, I recorded a presentation on the Jira integrations we offer at GitLab. This included showing how to setup and configure the GitLab for Jira Cloud app.

The current Youtube video in the docs is 4 years old and needs to be replaced (eg. the app UI in that video doesn't look the same as the present day app). However, the older video showcases alot of the Jira development panel functionality whereas the video I recorded does not.

Therefore I have made the following changes:

1. I've added the newer video in this MR
2. I've left the old video in as it can still be a reference for now.
3. I've added a date suffix to both videos so it's clear which is more current.

Related issues

Author's checklist

• Optional. Consider taking the GitLab Technical Writing Fundamentals course.
• Follow the:
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  • Documentation guidelines.
  • Style Guide.
• If you're adding a new page, add the product availability details under the H1 topic title.
• If you are a GitLab team member, request a review based on:
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If you are a GitLab team member and only adding documentation, do not add any of the following labels:

• ~"frontend"
• ~"backend"
• ~"type::bug"
• ~"database"

These labels cause the MR to be added to code verification QA issues.

Reviewer's checklist

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If you aren't sure which tech writer to ask, use roulette or ask in the #docs Slack channel.

• If the content requires it, ensure the information is reviewed by a subject matter expert.
• Technical writer review items:
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  • Ensure the appropriate labels are added to this MR.
  • Ensure a release milestone is set.
  • If relevant to this MR, ensure content topic type principles are in use, including:
    • The headings should be something you'd do a Google search for. Instead of Default behavior, say something like Default behavior when you close an issue.
    • The headings (other than the page title) should be active. Instead of Configuring GDK, say something like Configure GDK.
    • Any task steps should be written as a numbered list.
    • If the content still needs to be edited for topic types, you can create a follow-up issue with the docs-technical-debt label.
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