fix: Annotaterb model annotation incomplete migration (#13132)

This pull request fixes the model annotation tooling due to previous
incomplete migration from `annotate` to `annotaterb` gem (#12600). It
also improves the handling of serialized values in the
`InstallationConfig` model by ensuring a default value is set,
simplifying the code, and removing a workaround for YAML
deserialization.

**Annotation tooling updates:**

* Added `.annotaterb.yml` to configure the `annotate_rb` gem with
project-specific options, centralizing annotation settings.
* Replaced the custom `auto_annotate_models.rake` task with the standard
rake task from `annotate_rb`, and added `lib/tasks/annotate_rb.rake` to
load annotation tasks in development environments.
[[1]](diffhunk://#diff-9450d2359e45f1db407b3871dde787a25d60bb721aed179a65ffd2692e95fb4bL1-L61)
[[2]](diffhunk://#diff-578cdfc7ad56637e42472ea891ea286dff8803d9a1750afdbfeafec164d9b8b2R1-R8)

**Model serialization improvements:**

* Updated the `InstallationConfig` model to set a default value for the
`serialized_value` attribute, ensuring it always has a hash with
indifferent access and removing the need for a deserialization
workaround in the `value` method.
[[1]](diffhunk://#diff-b4bdde42c1ad0f584073818bd43dbd865b1b3b50d4701b131979f900d7c68297L22-R22)
[[2]](diffhunk://#diff-b4bdde42c1ad0f584073818bd43dbd865b1b3b50d4701b131979f900d7c68297L36-L39)

---------

Co-authored-by: Sojan Jose <sojan@pepalo.com>

lib/tasks/annotate_rb.rake

@@ -0,0 +1,8 @@
+# This rake task was added by annotate_rb gem.
+
+# Can set `ANNOTATERB_SKIP_ON_DB_TASKS` to be anything to skip this
+if Rails.env.development? && ENV['ANNOTATERB_SKIP_ON_DB_TASKS'].nil?
+  require 'annotate_rb'
+
+  AnnotateRb::Core.load_rake_tasks
+end

lib/tasks/auto_annotate_models.rake

@@ -1,61 +0,0 @@
-# NOTE: only doing this in development as some production environments (Heroku)
-# NOTE: are sensitive to local FS writes, and besides -- it's just not proper
-# NOTE: to have a dev-mode tool do its thing in production.
-if Rails.env.development?
-  require 'annotate_rb'
-
-  AnnotateRb::Core.load_rake_tasks
-
-  task :set_annotation_options do
-    # You can override any of these by setting an environment variable of the
-    # same name.
-    AnnotateRb::Options.set_defaults(
-      'additional_file_patterns' => [],
-      'routes' => 'false',
-      'models' => 'true',
-      'position_in_routes' => 'before',
-      'position_in_class' => 'before',
-      'position_in_test' => 'before',
-      'position_in_fixture' => 'before',
-      'position_in_factory' => 'before',
-      'position_in_serializer' => 'before',
-      'show_foreign_keys' => 'true',
-      'show_complete_foreign_keys' => 'false',
-      'show_indexes' => 'true',
-      'simple_indexes' => 'false',
-      'model_dir' => [
-        'app/models',
-        'enterprise/app/models',
-      ],
-      'root_dir' => '',
-      'include_version' => 'false',
-      'require' => '',
-      'exclude_tests' => 'true',
-      'exclude_fixtures' => 'true',
-      'exclude_factories' => 'true',
-      'exclude_serializers' => 'true',
-      'exclude_scaffolds' => 'true',
-      'exclude_controllers' => 'true',
-      'exclude_helpers' => 'true',
-      'exclude_sti_subclasses' => 'false',
-      'ignore_model_sub_dir' => 'false',
-      'ignore_columns' => nil,
-      'ignore_routes' => nil,
-      'ignore_unknown_models' => 'false',
-      'hide_limit_column_types' => 'integer,bigint,boolean',
-      'hide_default_column_types' => 'json,jsonb,hstore',
-      'skip_on_db_migrate' => 'false',
-      'format_bare' => 'true',
-      'format_rdoc' => 'false',
-      'format_markdown' => 'false',
-      'sort' => 'false',
-      'force' => 'false',
-      'frozen' => 'false',
-      'classified_sort' => 'true',
-      'trace' => 'false',
-      'wrapper_open' => nil,
-      'wrapper_close' => nil,
-      'with_comment' => 'true'
-    )
-  end
-end