Run gas-compare action on push to master

[ernestognw]

After #4824, the #4822 PR was synced. However, it is still not producing the gas comparison because the report from master is not executed given github.base_ref is empty when a commit triggered the run. In that case, the master report is just skipped.

With this change, we'll be running the comparison only in commits to master and pull requests targeting to master

PR Checklist

• Tests
• Documentation
• Changeset entry (run npx changeset add)

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Latest commit: 1eff419

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