[AC-1856] Add publish automation workflows

[AhyoungRyu]

I added a new workflow to automate our release process. But note that some steps should be done manually since we need to get an approval.

Steps need to be done manually

1. Create a new release tag release/v${version} and push a commit to create a release PR.
2. Run /bot create ticket to generate a ticket and push a notification via Slack channel.
3. Go to Actions tab and fill the target release branch name(release/v${version}) in the input box.

New steps will be done automatically by Github Actions

Before running the workflow, verifies the existence of the release branch namedin the remote repository. If the branch does not exist, the workflow will halt and prompt to create the branch and a Jira ticket with the pr-comment-bot.

1. Build chat-ai-widget module: runs npm run build:npm to build the package.
2. Publishing: Publishes the package to npm. If an npm_tag is provided through the workflow dispatch inputs, it uses this tag for the release.
3. CHANGELOG Generation
4. Dependency Update in packages/*: Automatically updates the @sendbird/chat-ai-widget version to latest. All the change will be pushed to the PR that we made manually.
5. Tagging and Pushing: after this step, self-service & url-webdemo(docs bot) script will be generated by CircleCI. Then these are should be done manually again.
   • Go to https://github.com/sendbird/gate-k8s and create a PR with the new tag
   • Get an approval to push them to public

[AhyoungRyu]

release-guide.md & script-publish.md also need to be updated. I'll update them once I address all the feedbacks :)

[liamcho]

Nice automation!