fix(params): Use correct event name pull_request (omit _target)

[8R0WNI3]

GitHub does not emit an event called pull_request_target but only a pull_request one. This one should be used instead to retrieve the respective author association (consistently like how it is done in the trusted-checkout action). Refs:

• https://docs.github.com/en/webhooks/webhook-events-and-payloads#pull_request

• cc-utils/.github/actions/trusted-checkout/action.yaml

  Line 255 in 7dd669e

  author_association = '${{ github.event.pull_request.author_association }}'

Release note:

Correctly determine author association in params action determine "can-push" status later

[gardener-prow]

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