Reduce allocations in turbo_stream_action_tag

[jonathanhefner]

This commit eliminates a few unnecessary allocations in turbo_stream_action_tag:

Benchmark

# frozen_string_literal: true
require "benchmark/memory"

class Helpers
  include Turbo::Streams::ActionHelper
end

class Message
  include ActiveModel::API
  def to_key() = [1]
end

helpers = Helpers.new
message = Message.new

Benchmark.memory do |x|
  helpers.turbo_stream_action_tag("remove", target: message) # warmup

  x.report("turbo_stream_action_tag") do
    helpers.turbo_stream_action_tag("remove", target: message)
  end
end

Before

Calculating -------------------------------------
turbo_stream_action_tag
                         2.554k memsize (     0.000  retained)
                        35.000  objects (     0.000  retained)
                        12.000  strings (     0.000  retained)

After

Calculating -------------------------------------
turbo_stream_action_tag
                         2.138k memsize (     0.000  retained)
                        31.000  objects (     0.000  retained)
                        12.000  strings (     0.000  retained)

[jonathanhefner]

Build failure seems to be unrelated. The failure first appeared at 627a0cd, though I'm not sure that commit is related either because the tests were passing for 6e35878 (the commit it merged).