Allow Minimal Access for Saml Group Links API

What does this MR do and why?

This change adds support for Minimal Access permission level when creating SAML group links. API only allowed standard access levels (Guest, Reporter, Developer, etc.), but now it also accepts the minimal access level as a valid option. Depending on the license/subscription, this is already allowed for the customer in the user interface.

References

• Resolves #420655 (closed)

Screenshots or screen recordings

Before	After

How to set up and validate locally

Create a SAML group link with the following Minimal Access for a group on your instance. Please use the patch listed below to allow for easy creation.

curl --request POST --header "PRIVATE-TOKEN: XXX" --header "Content-Type: application/json" --data '{ "saml_group_name": "my_group", "access_level": 5 }' --url  "http://localhost:3000/api/v4/groups/<GROUP-ID>/saml_group_links"

This should result in the following response.

{"name":"my_group","access_level":5,"member_role_id":null,"provider":null}

Patch

diff --git a/ee/lib/ee/gitlab/auth/saml/config.rb b/ee/lib/ee/gitlab/auth/saml/config.rb
index 74b6f46a8421b..e03156c611e25 100644
--- a/ee/lib/ee/gitlab/auth/saml/config.rb
+++ b/ee/lib/ee/gitlab/auth/saml/config.rb
@@ -20,7 +20,7 @@ def duo_add_on_groups
           end
 
           def group_sync_enabled?
-            self.class.enabled? && groups.present? && ::License.feature_available?(:saml_group_sync)
+            true
           end
 
           # This method is specific to a given provider.
diff --git a/lib/gitlab/auth/saml/config.rb b/lib/gitlab/auth/saml/config.rb
index d7aa4f721302f..61b96c73dfaf5 100644
--- a/lib/gitlab/auth/saml/config.rb
+++ b/lib/gitlab/auth/saml/config.rb
@@ -26,7 +26,7 @@ class Config
 
         class << self
           def enabled?
-            ::AuthHelper.saml_providers.any?
+            true
           end
 
           def default_attribute_statements

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