frontend: Improve error handling in list pages

[sniok]

This PR combines and replaces different fields we have for error handling, currently we have 'error' 'errorMessage' 'clusterErrors' props in various places.

error is not enough since we can have more than one error
errorMessage is a string and loses important context like which cluster the error is coming from and limits how we can render it
clusterErrors prop has a limitation of one error per cluster but we can have more (see Role page example)

New field is
errors an array of ApiError

ApiError is also updated to be a class instead of an interface and now contains all relevant information (if available) like cluster name, namespace of a resource and status code.

ApiError message is now also parsed from backend response (if available)

To display the error the ClusterGroupErrorMessage component was updated since it is already can display error.
I would also change the name to something more generic like ErrorAlerts or something but it's not a priority.

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Testing done / Examples

All error messages by default are collapsed, in screenshots I'll expand them

When resource is not available, endpoint returns 404

When user doesn't have access 403

When user doesn't have access and List page loads multiple resource
Role page loads Roles and ClusterRoles

When two clusters are selected and one of them doesn't have access

When two clusters are selected and one of them doesn't have access for a List page with multiple resources

Cluster overview page with no access

[sniok]

Updated the error message to use Alert component from mui, and made 403 error display as blue since it's probably expected that user with limited access won't be able to see some things

[joaquimrocha]

Pretty cool. I have left a couple of comments.