chore: setup-github-token gativ2 rollout - 20% allocation

[erikburt]

This dials up the allocation to GATI v2 migration from 0% to 20%.

Notes

• Bucketed rollout
• Buckets are determined by the calling repository's name ($GITHUB_REPOSITORY) (deterministic hash)
• If the repository's bucket falls below the allocation percentage, then it's opted in
• Opted in repos will be seamlessly migrated to use gati v2, and the v1 migration profiles

Rollback Instructions

• devex-cicd or prodsec needed (due to permissions)

1. git fetch --tags --force - ensure your tags are up to date
2. git tag -f setup-github-token/v1 setup-github-token/1.3.0 - retag it to the version with 0% allocation
3. git push origin --force setup-github-token/v1 - force push the retag

[github-actions]

🦋 Changeset is good to go

Latest commit: ce11444

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