[DSpace-CRIS] Implement detailed error handling for custom url conflicts

[FrancescoMolinaro]

References

Fixes: #5078
Relates to: #4814

Description

Implemented error handling on item page for custom url conflict.
Added direct link to administrative edit for item correction.

Instructions for Reviewers

Implemented a new component shown on the item page when a custom URL lookup returns a 500 error, which indicates that multiple items share the same dspace.customurl value.
Uses SearchService.search() with a dspace.customurl filter to find all items with the conflicting value, then renders a direct edit link (/edit-items/:FULL) for each result so administrators can immediately navigate to and fix the affected items.
Placed inside the item page template when itemRD.statusCode === 500 and the resolved route param is not a UUID (i.e. it was a custom URL lookup).

Step to reproduce:

• Define an identical custom url on multiple items
• Navigate to the item page of one of the items

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[tdonohue]

👍 Thanks @FrancescoMolinaro ! This looks great to me! I like the new detailed error message, and I find it useful that it provides advice and direct links to correct the problem. I tested this and found it works well. Code looks good too

So, in my opinion, this looks like a good solution to fix the blocker issue.

@kskaiser or @nwoodward : pinging both of you as you both helped with the initial testing of this Custom URL feature. Let me know if you have any outstanding concerns about the approach taken here. I plan to merge this PR later this week, assuming no objections.

[nwoodward]

👍 Thanks @FrancescoMolinaro! I tested this PR today, and it works well. I appreciate the links to edit the items with the same custom URL.

This isn't a showstopper for me, but my only issue is those edit links appear for everyone, including anonymous users and users who don't have permission to edit the items. Clicking on the links sends those users to a 403 Forbidden, so there's no chance they will edit them.

In theory, it would be nice in that case if users only saw a simple text list of items that share the same custom URL instead of the edit links, but again, I don't think this issue is large enough to delay this PR.

[FrancescoMolinaro]

Hi @nwoodward , @tdonohue , many thanks for the feedback, I have adapted the template so that for unauthenticated users only plain text will be displayed.
Regarding the issue mentioned in DSpace/DSpace#12281 I think we might need to improve the response for the search with method findByCustomUrl, so that is clear that the error is caused by wrong characters and we don't duplicate the logic also on the front.
I will do a check and come back asap with a possible solution/proposal.