Add workflow for automatic issue deduplication

[cinnamon-msft]

• I have signed the Contributor License Agreement.
• I have updated the Release Notes.
• This pull request is related to an issue.

---

This adds a bot to automatically detect duplicate issues after an issue is opened or re-opened. It can only apply the "duplicate" label. It will not close the issue and it will leave a comment with the duplicate issue(s).

Microsoft Reviewers: Open in CodeFlow

[evenstensberg]

@cinnamon-msft is there any documentation on your grammar linting? Would like to explore the action and how it works.

[denelon]

@evenstensberg. You should be able to find the action at GitHub.
https://github.com/pelikhan/action-genai-issue-dedup

[evenstensberg]

I guess this will be very costly for non-microsoft projects?

[denelon]

It depends on the project. I didn't really look too deeply.
I'd start: https://docs.github.com/en/billing/concepts/product-billing/github-actions

[evenstensberg]

Any chance that microsoft would like to sponsor webpack with this?

[evenstensberg]

If so, we're only interested of having this in webpack core (https://github.com/webpack/webpack/issues)

[denelon]

The action wasn't built by "Microsoft". There should be some capacity for an open-source project based on the link I shared, but I don't have any ability to sponsor anything.