label for contracts artifact release workflow to run before merge

[vicentevieytes]

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[Copilot]

Pull request overview

Updates the TON contracts compiled-artifacts publishing workflow so it can be explicitly opted into on pull requests via a label, while preserving existing behavior for main pushes and manual dispatch runs.

Changes:

• Add pull_request event types to include labeled (and explicitly list existing default PR actions).
• Gate the publish job on PRs behind the build-publish-contracts label (while still requiring relevant contract/workflow changes or a manual dispatch).

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[Copilot]

With pull_request triggering on opened/synchronize/reopened (plus labeled), the workflow will still run the changes job for PRs that don’t have the build-publish-contracts label, even though publish will be skipped. If the intent is to only spend CI time when the label is present, consider adding a similar label-gated if: to the changes job (or otherwise gating early), so the workflow no-ops quickly on unlabeled PR events.