Enable frozen string in app/graphql + app/finders

Partially addresses #47424.

app/graphql/functions/base_function.rb

+# frozen_string_literal: true
+
 module Functions
   class BaseFunction < GraphQL::Function
   end

app/graphql/functions/echo.rb

+# frozen_string_literal: true
+
 module Functions
   class Echo < BaseFunction
     argument :text, GraphQL::STRING_TYPE

app/graphql/gitlab_schema.rb

+# frozen_string_literal: true
+
 class GitlabSchema < GraphQL::Schema
   use BatchLoader::GraphQL
   use Gitlab::Graphql::Authorize

app/graphql/mutations/concerns/mutations/resolves_project.rb

+# frozen_string_literal: true
+
 module Mutations
   module ResolvesProject
     extend ActiveSupport::Concern

app/graphql/mutations/merge_requests/base.rb

+# frozen_string_literal: true
+
 module Mutations
   module MergeRequests
     class Base < BaseMutation

app/graphql/resolvers/base_resolver.rb

+# frozen_string_literal: true
+
 module Resolvers
   class BaseResolver < GraphQL::Schema::Resolver
   end

app/graphql/resolvers/concerns/resolves_pipelines.rb

+# frozen_string_literal: true
+
 module ResolvesPipelines
   extend ActiveSupport::Concern

app/graphql/resolvers/full_path_resolver.rb

+# frozen_string_literal: true
+
 module Resolvers
   module FullPathResolver
     extend ActiveSupport::Concern

app/graphql/resolvers/merge_request_pipelines_resolver.rb

+# frozen_string_literal: true
+
 module Resolvers
   class MergeRequestPipelinesResolver < BaseResolver
     include ::ResolvesPipelines

app/graphql/resolvers/merge_request_resolver.rb

+# frozen_string_literal: true
+
 module Resolvers
   class MergeRequestResolver < BaseResolver
     argument :iid, GraphQL::ID_TYPE,

app/graphql/resolvers/project_pipelines_resolver.rb

+# frozen_string_literal: true
+
 module Resolvers
   class ProjectPipelinesResolver < BaseResolver
     include ResolvesPipelines

app/graphql/resolvers/project_resolver.rb

+# frozen_string_literal: true
+
 module Resolvers
   class ProjectResolver < BaseResolver
     prepend FullPathResolver

app/graphql/types/base_enum.rb

+# frozen_string_literal: true
+
 module Types
   class BaseEnum < GraphQL::Schema::Enum
   end

app/graphql/types/base_field.rb

+# frozen_string_literal: true
+
 module Types
   class BaseField < GraphQL::Schema::Field
     prepend Gitlab::Graphql::Authorize

app/graphql/types/base_input_object.rb

+# frozen_string_literal: true
+
 module Types
   class BaseInputObject < GraphQL::Schema::InputObject
   end

app/graphql/types/base_interface.rb

+# frozen_string_literal: true
+
 module Types
   module BaseInterface
     include GraphQL::Schema::Interface

app/graphql/types/base_object.rb

+# frozen_string_literal: true
+
 module Types
   class BaseObject < GraphQL::Schema::Object
     prepend Gitlab::Graphql::Present

app/graphql/types/base_scalar.rb

+# frozen_string_literal: true
+
 module Types
   class BaseScalar < GraphQL::Schema::Scalar
   end

app/graphql/types/base_union.rb

+# frozen_string_literal: true
+
 module Types
   class BaseUnion < GraphQL::Schema::Union
   end

app/graphql/types/ci/pipeline_status_enum.rb

+# frozen_string_literal: true
+
 module Types
   module Ci
     class PipelineStatusEnum < BaseEnum