DEV: Refactor migrations-tooling

* Updates GitHub Action for migrations
* Rubocop: Always `EnforcedShorthandSyntax` for hashes in the `migrations` directory
* Automatically load all available converter steps
* Enable YJIT at runtime, if available
* Progressbar shows skipped records and other small improvements

migrations/scripts/benchmarks/hash_vs_data.rb

@@ -20,7 +20,7 @@ User = Data.define(:id, :name, :email, :created_at)
 USER_HASH =
   begin
     name = SecureRandom.hex(10)
-    { id: 1, name: name, email: "#{name}@example.com", created_at: Time.now.utc.iso8601 }
+    { id: 1, name:, email: "#{name}@example.com", created_at: Time.now.utc.iso8601 }
   end
 
 USER_DATA =

migrations/scripts/benchmarks/parameter_binding.rb

@@ -41,7 +41,7 @@ end
 def create_users(row_count)
   row_count.times.map do |id|
     name = SecureRandom.hex(10)
-    { id: id, name: name, email: "#{name}@example.com", created_at: Time.now.utc.iso8601 }
+    { id:, name:, email: "#{name}@example.com", created_at: Time.now.utc.iso8601 }
   end
 end