Remove has_many :source usages

(cherry picked from commit 016c9a30e1ea484bf7c17341b2260b4f00c5931a)

app/models/user.rb

@@ -127,7 +127,7 @@ class User < ApplicationRecord
 
   # Groups
   has_many :members
-  has_many :group_members, -> { where(requested_at: nil).where("access_level >= ?", Gitlab::Access::GUEST) }, source: 'GroupMember'
+  has_many :group_members, -> { where(requested_at: nil).where("access_level >= ?", Gitlab::Access::GUEST) }, class_name: 'GroupMember'
   has_many :groups, through: :group_members
   has_many :owned_groups, -> { where(members: { access_level: Gitlab::Access::OWNER }) }, through: :group_members, source: :group
   has_many :maintainers_groups, -> { where(members: { access_level: Gitlab::Access::MAINTAINER }) }, through: :group_members, source: :group
@@ -141,7 +141,7 @@ class User < ApplicationRecord
            -> { where(members: { access_level: [Gitlab::Access::REPORTER, Gitlab::Access::DEVELOPER, Gitlab::Access::MAINTAINER, Gitlab::Access::OWNER] }) },
            through: :group_members,
            source: :group
-  has_many :minimal_access_group_members, -> { where(access_level: [Gitlab::Access::MINIMAL_ACCESS]) }, source: 'GroupMember', class_name: 'GroupMember'
+  has_many :minimal_access_group_members, -> { where(access_level: [Gitlab::Access::MINIMAL_ACCESS]) }, class_name: 'GroupMember'
   has_many :minimal_access_groups, through: :minimal_access_group_members, source: :group
 
   # Projects

ee/app/models/ee/user.rb

@@ -49,7 +49,7 @@ module EE
       has_many :approvals,                dependent: :destroy # rubocop: disable Cop/ActiveRecordDependent
       has_many :approvers,                dependent: :destroy # rubocop: disable Cop/ActiveRecordDependent
 
-      has_many :minimal_access_group_members, -> { where(access_level: [::Gitlab::Access::MINIMAL_ACCESS]) }, source: 'GroupMember', class_name: 'GroupMember'
+      has_many :minimal_access_group_members, -> { where(access_level: [::Gitlab::Access::MINIMAL_ACCESS]) }, class_name: 'GroupMember'
       has_many :minimal_access_groups, through: :minimal_access_group_members, source: :group
 
       has_many :users_ops_dashboard_projects
@@ -57,7 +57,7 @@ module EE
       has_many :users_security_dashboard_projects
       has_many :security_dashboard_projects, through: :users_security_dashboard_projects, source: :project
 
-      has_many :group_saml_identities, -> { where.not(saml_provider_id: nil) }, source: :identities, class_name: "::Identity"
+      has_many :group_saml_identities, -> { where.not(saml_provider_id: nil) }, class_name: "::Identity"
 
       # Protected Branch Access
       has_many :protected_branch_merge_access_levels, dependent: :destroy, class_name: "::ProtectedBranch::MergeAccessLevel" # rubocop:disable Cop/ActiveRecordDependent