[#49133] throw better error message when admin tries to delete/disable OP user/group

[SwikritiT]

Related workpackage[OP#49133]: https://community.openproject.org/work_packages/49133

We are protecting user/group Openproject from being deleted/disabled but the error message displayed is An error occurred during the request. Unable to proceed which is vague. So show proper error messages so that it's known that this user is protected.

In this PR, we let the user know that the OP user/group is protected and redirect them towards open project troubleshooting docs for further information

The error message displayed now is

[SagarGi]

LGTM 👍

[github-actions]

JS Code Coverage

Coverage after merging fix/error-message-op-user-deletion into master will be

90.30%

Coverage Report

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[github-actions]

PHP Code Coverage

Coverage after merging fix/error-message-op-user-deletion into master will be

57.18%

Coverage Report

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