Translate Trilogy syscall errors as conn failed

At GitHub we get a fair number of Trilogy `ETIMEDOUT` errors (for known
reasons that we might be able to improve somewhat, but I doubt we'll
make them go away entirely). These are very much retryable network
errors, so it'd be handy if these `ETIMEDOUT` errors were translated to
`ConnectionFailed` instead of `StatementInvalid`, making them
`retryable_connection_error`s.

https://github.com/rails/rails/blob/ed2bc92b82ddc111150cdf48bb646fd97b3baacb/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb#L1077

We're already translating `ECONNRESET` (via matching on the error
message) and `EPIPE` to `ConnectionFailed`. Rather than adding another
case, this commit treats all of the Trilogy `SystemCallError` subclasses
as `ConnectionFailed`.

This commit also drops `TRILOGY_INVALID_SEQUENCE_ID`,
`TRILOGY_UNEXPECTED_PACKET` as `ConnectionFailed`. These are not
transient network errors we might want to retry. These are MySQL
client/server protocol errors, likely indicating something we need to
fix in Trilogy.

We should be able to simplify this exception translation further once we
bump the required Trilogy version to 2.6, but I figured I'd start out
with this minimal change that works on Trilogy 2.4 as well.

activerecord/lib/active_record/connection_adapters/trilogy_adapter.rb

@@ -205,10 +205,10 @@ def translate_exception(exception, message:, sql:, binds:)
           end
 
           case exception
-          when Errno::EPIPE, SocketError, IOError
+          when SocketError, IOError
             return ConnectionFailed.new(message, connection_pool: @pool)
           when ::Trilogy::Error
-            if /Connection reset by peer|TRILOGY_CLOSED_CONNECTION|TRILOGY_INVALID_SEQUENCE_ID|TRILOGY_UNEXPECTED_PACKET/.match?(exception.message)
+            if exception.message.include?("TRILOGY_CLOSED_CONNECTION") || exception.is_a?(SystemCallError)
               return ConnectionFailed.new(message, connection_pool: @pool)
             end
           end

activerecord/test/cases/adapters/trilogy/trilogy_adapter_test.rb

@@ -351,6 +351,38 @@ class TrilogyAdapterTest < ActiveRecord::TrilogyTestCase
     ActiveRecord::Base.establish_connection :arunit
   end
 
+  test "EPIPE raises ActiveRecord::ConnectionFailed" do
+    assert_raises(ActiveRecord::ConnectionFailed) do
+      @conn.raw_connection.stub(:query, -> (*) { raise Trilogy::SyscallError::EPIPE }) do
+        @conn.execute("SELECT 1")
+      end
+    end
+  end
+
+  test "ETIMEDOUT raises ActiveRecord::ConnectionFailed" do
+    assert_raises(ActiveRecord::ConnectionFailed) do
+      @conn.raw_connection.stub(:query, -> (*) { raise Trilogy::SyscallError::ETIMEDOUT }) do
+        @conn.execute("SELECT 1")
+      end
+    end
+  end
+
+  test "ConnectionRefusedError raises ActiveRecord::ConnectionFailed" do
+    assert_raises(ActiveRecord::ConnectionFailed) do
+      @conn.raw_connection.stub(:query, -> (*) { raise Trilogy::ConnectionRefusedError }) do
+        @conn.execute("SELECT 1")
+      end
+    end
+  end
+
+  test "ConnectionResetError raises ActiveRecord::ConnectionFailed" do
+    assert_raises(ActiveRecord::ConnectionFailed) do
+      @conn.raw_connection.stub(:query, -> (*) { raise Trilogy::ConnectionResetError }) do
+        @conn.execute("SELECT 1")
+      end
+    end
+  end
+
   # Create a temporary subscription to verify notification is sent.
   # Optionally verify the notification payload includes expected types.
   def assert_notification(notification, expected_payload = {}, &block)