Add `spec` column to `catalog_resource_components`

When we add CI steps to the CI Catalog, we'll need to store the entire
`spec` header section in the table. This commit is the first step
towards migrating from the `inputs` field to a new `spec` field that
will support the needs of both steps and components.

Changelog: added
Issue: #443662

db/migrate/20240305161009_add_spec_column_to_catalog_resource_components.rb

+# frozen_string_literal: true
+
+class AddSpecColumnToCatalogResourceComponents < Gitlab::Database::Migration[2.2]
+  milestone '16.10'
+
+  def change
+    add_column :catalog_resource_components, :spec, :jsonb, default: {}, null: false
+  end
+end

db/schema_migrations/20240305161009

+859678748977604a3e7f38be44498049dba5c8f7eee6cb6c46a7e3e0f3895bf0
\ No newline at end of file

db/structure.sql

@@ -5610,6 +5610,7 @@ CREATE TABLE catalog_resource_components (
     inputs jsonb DEFAULT '{}'::jsonb NOT NULL,
     name text NOT NULL,
     path text,
+    spec jsonb DEFAULT '{}'::jsonb NOT NULL,
     CONSTRAINT check_a76bfd47fe CHECK ((char_length(path) <= 255)),
     CONSTRAINT check_ddca729980 CHECK ((char_length(name) <= 255))
 );