Tracking issue: Port everything to ESM

In preparation of an ESM release, we should first make all examples and adapters ESM-only, and also move all projects in this organization to ESM

Changing the adapters already encourages people to migrate without impacting probot itself, and updating the examples and create-probot-app will make new users hopefully use ESM.

The list below is sorted in the order we should merge the changes to ensure a smooth migration.

• probot/probot.github.io: probot/probot#1957, https://github.com/probot/probot.github.io/pull/527
• probot/create-probot-app: https://github.com/probot/create-probot-app/pull/841
• probot/example-github-action: https://github.com/probot/example-github-action/pull/98
• probot/example-begin Begin shut down, repository archived
• probot/example-netlify-functions: https://github.com/probot/example-netlify-functions/pull/37
• probot/example-vercel
• probot/example-azure-function
• probot/example-aws-lambda-serverless
• probot/hello-world
• probot/invite
• probot/reminders
• probot/unfurl
• probot/adapter-azure-functions
• probot/adapter-github-actions: https://github.com/probot/adapter-github-actions/pull/79
• probot/adapter-aws-lambda-serverless: https://github.com/probot/adapter-aws-lambda-serverless/pull/143
• probot/metadata
• probot/attachments
• probot/commands
• probot/probot: probot/probot#1922, probot/probot#1957 (Released on beta)
• probot/octokit-plugin-config: https://github.com/probot/octokit-plugin-config/pull/249
• probot/get-private-key: https://github.com/probot/get-private-key/pull/131
• probot/octokit-auth-probot: https://github.com/probot/octokit-auth-probot/pull/272
• probot/smee-client
• probot/auth-routes
• probot/pino#336