chore: 🤖 add Slack notifications for PRs and tag group name subscribers

[punkbit]

Why?

Currently, visibility on new Pull Requests is inconsistent, leading to delayed feedback loops and missed opportunities for early collaboration. To address this, I’m introducing a new GitHub Action that automates Slack notifications. For example, we've experienced PR that takes longer than >= 3 weeks for any comments or feedback.

This change puts the control back into the developers' hands. You can choose how you want to stay informed, e.g., by joining a tag group or monitoring activity in the channel at your own pace.

Basically, the automation is to reduce or eliminate "missed PRs" and the need for manual follow-ups. Whether they subscribe or not, the consumers/users take responsibility for their level of involvement in the review process.

How?

• Every new Pull Request will now trigger a message to Slack (specific channel)
• The bot specifically pings the custom tag name user group, e.g. subscription-based user can opt-in or opt-out
• Designed to incentivise feedback at the earliest possible stage rather than waiting for manual pings, which in some cases might be interrupting others

Contribution checklist?

• You've done enough research before writing
• You have reviewed the PR
• The commit messages are detailed
• The build command runs locally
• Assets or static content are linked and stored in the project
• For documentation, guides or references, you've tested the commands

Security checklist?

• All user inputs are validated and sanitised
• No usage of dangerouslySetInnerHTML
• Sensitive data has been identified and is being protected properly
• Build output contains no secrets or API keys

Preview?

N/A

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