[5.2] Delete user access level - check for levels in use

[chmst]

Pull Request replacing #39654

Summary of Changes

An access level can only be deleted if there is no content which uses this level. But there is no information given, which tabels are concerned.
This PR adds the list of tables to the error message. It adds the delete method to the model and makes a check for all leves on all tables.

Testing Instructions

Add one or more access levels.
Set this access level for some items in your content, an article, a contact, a module .. whatever.
Then try to delete this access level.

Actual result BEFORE applying this Pull Request

You get a message
"You can't delete the view access level '%d:%s' because it is being used by content."

Expected result AFTER applying this Pull Request

Information is diplayed for all levels, where they are used.
This enables the experienced user to find the components and filter there for these levels.

Only leves are deleted (in my test above it was one (1) which are not in use.

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

[exlemor]

I have tested this item ✅ successfully on e449b22

I was able to test this successfully.

Just one tiny correction, the message after Patch is correct unlike the photo:

(photo) View Access Levels removed ---> (site) No View Access Levels removed.

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[chmst]

In this case I wanted to delete 3 levels. One of them was deleted. Two of them could not be deleted, they are still in use. This is a bit confusing on the screen

[exlemor]

Ah ok. In my case, I tried to delete just 1 level.

[cybersalt]

I have tested this item ✅ successfully on 615eb4e

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/43223.} I created 3 access levels, assigned 3 different articles (one to each) and then tried deleting the 3 levels. The message was the same for all three levels.

[exlemor]

I have tested this item ✅ successfully on 615eb4e

I have successfully tested it with 2 levels and multiple assets connected to said user levels.

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[johnaspr]

I have tested this item ✅ successfully on 615eb4e

I was able to test this. Message after applying the patch: "You can't delete the view access level(s)
Level with ID 8 is being used in the database tables: ifsam_content, ifsam_finder_links."

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[alikon]

rtc

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[HLeithner]

This pull request has been automatically rebased to 5.2-dev.

[chmst]

Changed the code for displaying the message as requested.

[pe7er]

Thanks for this PR @chmst
This PR has been changed, @cybersalt @exlemor @johnaspr Could you please test again?

[dorisdreher]

I have tested this item ✅ successfully on f8ee84c

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[KingLouis1]

I have tested this item ✅ successfully on f8ee84c

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[crimle]

I have tested this item ✅ successfully on f8ee84c

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[MacJoom]

I have tested this item ✅ successfully on f8ee84c

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[pe7er]

Thanks @chmst !