Add conditional check_if_write_query for Rails 8.1 compatibility

[Copilot]

Rails 8.1 deprecated AbstractAdapter#check_if_write_query(), which is called by the redshift adapters in execute_and_clear.

Changes

• Added conditional implementation of check_if_write_query to redshift_8_0_adapter.rb, redshift_7_2_adapter.rb, and redshift_7_1_adapter.rb
• Method is only defined when not present in AbstractAdapter, ensuring compatibility across Rails versions

# Rails 8.1 deprecated AbstractAdapter#check_if_write_query
# Implement it here for compatibility if it doesn't exist in the parent class
unless AbstractAdapter.method_defined?(:check_if_write_query)
  def check_if_write_query(sql)
    return unless preventing_writes? && write_query?(sql)

    raise ActiveRecord::ReadOnlyError, "Write query attempted while in readonly mode: #{sql}"
  end
end

This maintains identical behavior to the original Rails implementation while supporting both Rails versions with and without the deprecated method.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Rails 8.1 deprecated AbstractAdapter#check_if_write_query() method, which breaks compatibility of this library</issue_title>
<issue_description>## Problem
Rails 8.1 deprecated AbstractAdapter#check_if_write_query() method, which breaks compatibility of this library.

The original method code is this:

  def check_if_write_query(sql)
    return unless preventing_writes? && write_query?(sql)

    raise ActiveRecord::ReadOnlyError, "Write query attempted while in readonly mode: #{sql}"
  end

You can reimplement the same method for the 8.0-related adapter, but only if it doesn't exist yet in the runtime from the AbstractAdapter.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Rails 8.1 deprecated AbstractAdapter#check_if_write_query() method, which breaks compatibility of this library #1

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