Adjust CLI notification messages

What does this MR do and why?

This MR closes https://gitlab.com/gitlab-org/gitlab/-/issues/360326

• Adjust the namespace CLI notification messages for warnings to show only on the 0.95 alert level
• The error messages in the pos_recieve were not reached since it was returning in the pre-hook
• The only place we can adjust the namespace error messages are NamespaceStorageSizeErrorMessage
• NamespaceStorageSizeErrorMessage used to have storage_limit_reached_error_msg which shows no usage data
• Adjust the CLI notifications for errors, to include the usage data, and remove storage_limit_reached_error_msg
• Overall we should not have any class methods here since we need the usage data always for messages
• Change the commit_error to be independent, after it was using the push_error
• Add the new usage data details to the push_error which is first touched in the CLI
• Add a new class for CLI notifications, 'Namespaces::Storage::CliNotification'
• Adjust docs to include notifications delivery notes in doc/user/usage_quotas.md
• This MR is not changing anything for banners notifications, banner changes are in !106697 (merged)

How to set up and validate locally

Please follow the steps in !111066 (merged) once it's merged.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.