Enable more frozen string in lib/**/*.rb

Enables frozen for the following:

* lib/*.rb
* lib/banzai/**/*.rb
* lib/bitbucket/**/*.rb
* lib/constraints/**/*.rb
* lib/container_registry/**/*.rb
* lib/declarative_policy/**/*.rb

Partially addresses #47424.

changelogs/unreleased/more-frozen-string-enable-lib.yml

+---
+title: Enable more frozen string in lib/**/*.rb
+merge_request:
+author: gfyoung
+type: performance

lib/after_commit_queue.rb

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

lib/backup.rb

+# frozen_string_literal: true
+
 module Backup
   Error = Class.new(StandardError)
 end

lib/banzai.rb

+# frozen_string_literal: true
+
 module Banzai
   # if you need to render markdown, then you probably need to post_process as well,
   # such as removing references that the current user doesn't have

lib/banzai/color_parser.rb

+# frozen_string_literal: true
+
 module Banzai
   module ColorParser
     ALPHA = /0(?:\.\d+)?|\.\d+|1(?:\.0+)?/ # 0.0..1.0

lib/banzai/commit_renderer.rb

+# frozen_string_literal: true
+
 module Banzai
   module CommitRenderer
     ATTRIBUTES = [:description, :title].freeze

lib/banzai/cross_project_reference.rb

+# frozen_string_literal: true
+
 module Banzai
   # Common methods for ReferenceFilters that support an optional cross-project
   # reference.

lib/banzai/filter.rb

+# frozen_string_literal: true
+
 module Banzai
   module Filter
     def self.[](name)

lib/banzai/filter/markdown_engines/common_mark.rb

+# frozen_string_literal: true
+
 # `CommonMark` markdown engine for GitLab's Banzai markdown filter.
 # This module is used in Banzai::Filter::MarkdownFilter.
 # Used gem is `commonmarker` which is a ruby wrapper for libcmark (CommonMark parser)

lib/banzai/filter/markdown_engines/redcarpet.rb

+# frozen_string_literal: true
+
 # `Redcarpet` markdown engine for GitLab's Banzai markdown filter.
 # This module is used in Banzai::Filter::MarkdownFilter.
 # Used gem is `redcarpet` which is a ruby library for markdown processing.

lib/banzai/filter/wiki_link_filter/rewriter.rb

+# frozen_string_literal: true
+
 module Banzai
   module Filter
     class WikiLinkFilter < HTML::Pipeline::Filter

lib/banzai/filter_array.rb

+# frozen_string_literal: true
+
 module Banzai
   class FilterArray < Array
     # Insert a value immediately after another value

lib/banzai/issuable_extractor.rb

+# frozen_string_literal: true
+
 module Banzai
   # Extract references to issuables from multiple documents
 

lib/banzai/object_renderer.rb

+# frozen_string_literal: true
+
 module Banzai
   # Class for rendering multiple objects (e.g. Note instances) in a single pass,
   # using +render_field+ to benefit from caching in the database. Rendering and

lib/banzai/pipeline.rb

+# frozen_string_literal: true
+
 module Banzai
   module Pipeline
     def self.[](name)

lib/banzai/pipeline/ascii_doc_pipeline.rb

+# frozen_string_literal: true
+
 module Banzai
   module Pipeline
     class AsciiDocPipeline < BasePipeline

lib/banzai/pipeline/atom_pipeline.rb

+# frozen_string_literal: true
+
 module Banzai
   module Pipeline
     class AtomPipeline < FullPipeline

lib/banzai/pipeline/base_pipeline.rb

+# frozen_string_literal: true
+
 module Banzai
   module Pipeline
     class BasePipeline

lib/banzai/pipeline/broadcast_message_pipeline.rb

+# frozen_string_literal: true
+
 module Banzai
   module Pipeline
     class BroadcastMessagePipeline < DescriptionPipeline

lib/banzai/pipeline/combined_pipeline.rb

+# frozen_string_literal: true
+
 module Banzai
   module Pipeline
     module CombinedPipeline