Add Additional Error Messages When Minimal Access Role is Not Available

What does this MR do and why?

Solves Issue #331012 (closed)

The changed code adds the errors below to the existing "is not included in the list" message:

• supported on top level group only - if adding a user with minimal access to a subgroup
• not supported by all license types - if minimal access is not supported by the current license

This MR is an extended from this community contribution !62044 (closed)

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How to set up and validate locally

curl --request PUT --header "PRIVATE-TOKEN: $GL_TOKEN" "http://localhost:3000/api/v4/groups/126/members/17?access_level=5"
{"message":{"access_level":["is not included in the list","not supported by all license types"]}}

curl --request POST --header "PRIVATE-TOKEN: $GL_TOKEN" "http://localhost:3000/api/v4/groups/126/members?user_id=18&access_level=5"
{"message":{"access_level":["is not included in the list","not supported by all license types"]}}

MR acceptance checklist

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