Remove unnecessary includes of ShellAdapter

Determined by running the script:

```
included = `git grep --name-only ShellAdapter`.chomp.split("\n")
used = `git grep --name-only gitlab_shell`.chomp.split("\n")
included - used
```

6 files changed, 2 insertions, 6 deletions

diff --git a/app/models/concerns/storage/legacy_namespace.rb b/app/models/concerns/storage/legacy_namespace.rb
index af699eeebce..498996f4f80 100644
--- a/app/models/concerns/storage/legacy_namespace.rb
+++ b/app/models/concerns/storage/legacy_namespace.rb
@@ -4,6 +4,8 @@ module Storage
   module LegacyNamespace
     extend ActiveSupport::Concern
 
+    include Gitlab::ShellAdapter
+
     def move_dir
       proj_with_tags = first_project_with_container_registry_tags
 
diff --git a/app/models/members/project_member.rb b/app/models/members/project_member.rb
index 537f2a3a231..016c18ce6c8 100644
--- a/app/models/members/project_member.rb
+++ b/app/models/members/project_member.rb
@@ -3,8 +3,6 @@
 class ProjectMember < Member
   SOURCE_TYPE = 'Project'.freeze
 
-  include Gitlab::ShellAdapter
-
   belongs_to :project, foreign_key: 'source_id'
 
   # Make sure project member points only to project as it source
diff --git a/app/models/namespace.rb b/app/models/namespace.rb
index 8865c164b11..3c9b1d32a53 100644
--- a/app/models/namespace.rb
+++ b/app/models/namespace.rb
@@ -3,7 +3,6 @@
 class Namespace < ActiveRecord::Base
   include CacheMarkdownField
   include Sortable
-  include Gitlab::ShellAdapter
   include Gitlab::VisibilityLevel
   include Routable
   include AfterCommitQueue
diff --git a/app/models/protected_branch.rb b/app/models/protected_branch.rb
index 6c1073265a1..d075440b147 100644
--- a/app/models/protected_branch.rb
+++ b/app/models/protected_branch.rb
@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 
 class ProtectedBranch < ActiveRecord::Base
-  include Gitlab::ShellAdapter
   include ProtectedRef
 
   protected_ref_access_levels :merge, :push
diff --git a/app/models/protected_tag.rb b/app/models/protected_tag.rb
index 94746141945..d28ebabfe49 100644
--- a/app/models/protected_tag.rb
+++ b/app/models/protected_tag.rb
@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 
 class ProtectedTag < ActiveRecord::Base
-  include Gitlab::ShellAdapter
   include ProtectedRef
 
   validates :name, uniqueness: { scope: :project_id }
diff --git a/app/models/repository.rb b/app/models/repository.rb
index 35dd120856d..015a179f374 100644
--- a/app/models/repository.rb
+++ b/app/models/repository.rb
@@ -17,7 +17,6 @@ class Repository
     #{REF_ENVIRONMENTS}
   ].freeze
 
-  include Gitlab::ShellAdapter
   include Gitlab::RepositoryCacheAdapter
 
   attr_accessor :full_path, :disk_path, :project, :is_wiki