build: re-add auto-add for PRs with a different target #1189
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This PR re-enables the auto-add-to-project for PRs but uses a different event (it was previously removed in #1011). Instead of using pull_request, it relies on pull_request_target https://docs.github.com/en/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows#pull_request_target. The pull_request_target allows running the GA on pull request base branch context and is recommended to use only if the underlying actions are NOT using / running any code from PR. The docs suggest using this if one needs to add labels or comments to PR.