Summary

This PR aims to extend the default ack timeout from 3 seconds to 10 seconds for function_executed events received over HTTP and Express receiver

Testing

1. lack create -t slack-samples/bolt-ts-custom-step-template
2. Modify the app so that it uses the HTTP receiver or Express receiver

const { App, LogLevel, ExpressReceiver } = require('@slack/bolt');

const receiver = new ExpressReceiver({
  signingSecret: process.env.SLACK_SIGNING_SECRET,
});

const app = new App({
  token: process.env.SLACK_BOT_TOKEN,
  appToken: process.env.SLACK_APP_TOKEN,
  logLevel: LogLevel.INFO,
  receiver: receiver
});

3. Modify the function handler so that it manually handles ack behavior, and sleeps for 9 seconds

function sleep(seconds) {
  return new Promise((resolve) => {
    setTimeout(resolve, seconds * 1000);
  });
}

app.function('sample_step', { autoAcknowledge: false }, async ({ ack, inputs, complete, fail, logger }) => {
  logger.info('sleeping');
  await sleep(9);
  logger.info('done sleeping');

   await complete!({ outputs: { user_id: user.id } });
   wait ack();
})

4. You may experience retries or failures from the Slack backend but this isn't the goal of these changes, what should be noted is that Bolt does not invoke the unhandledRequestHandler, does not print an error and does not response to the request with a 404

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.