fix: add diagnistics script to sidebars

[hisImminence]

Description

This fix adds the diagnostic script to the sidebars of version 8.4-8.7 (it was missed in the prior PR https://github.com/camunda/camunda-docs/pull/5683/files and only added to the sidebar of 8.8)

When should this change go live?

• This is a bug fix, security concern, or something that needs urgent release support. (add bug or support label)
• This is already available but undocumented and should be released within a week. (add available & undocumented label)
• This is on a specific schedule and the assignee will coordinate a release with the Documentation team. (create draft PR and/or add hold label)
• This is part of a scheduled alpha or minor. (add alpha or minor label)
• There is no urgency with this change (add low prio label)

PR Checklist

• My changes are for an upcoming minor release and are in the /docs directory (version 8.8).
• My changes are for an already released minor and are in a /versioned_docs directory.

• I added a DRI, team, or delegate as a reviewer for technical accuracy and grammar/style:
  • Engineering team review
  • Technical writer review via @camunda/tech-writers unless working with an embedded writer.

[hisImminence]

Confirmed that all scripts are showing now up in the sidebar of the versions!

[mesellings]

@hisImminence Does this page exist in 8.4? I'm not sure this should be in the 8.4 sidebar?

[hisImminence]

Oh you are right - moved it under the operational-guide! Thanks!

[mesellings]

@hisImminence I saw the problem was in the file path, so I've adjusted it to point to the platform-deployment path, and it now appears in the sidebar under troubleshooting as I think you wanted? We don't need to move it for 8.4 as that would need redirects etc - I think this is the sidebar behaviour you were after?

[mesellings]

Assuming the sidebar fix is correct, happy to approve! 🚀

One thing @hisImminence is that I notice the changes to the 8.8 file following review of #5683 were not propagated to 8.4 -8.7 - we should create a new docs issue to fix this, unless you want to handle it in this PR? Would you like me to take this?

[github-actions]

🧹 Preview environment for this PR has been torn down.

[mesellings]

@hisImminence TW review comments backport work for 8.4-8.7 covered in #5753