refactor: rename GitHub runner ScaledJob

[martinothamar]

Summary

Rename the remaining live ScaledJob identity from github-runners-sandbox to github-runners, now that the sandbox-backed runner is the only GitHub runner variant. The self-hosted-ubuntu runner label and runtime configuration are unchanged.

This PR is stacked on #20079. Its diff against main will contain the parent cleanup until #20079 merges.

Merge conditions

• merge and fully deploy chore: remove legacy GitHub runner variants #20079 first, so the legacy github-runners resource has been pruned
• wait until github-runners-sandbox has no active Jobs before merging this PR

Deleting the old ScaledJob identity while it owns active Jobs may cascade-delete those Jobs.

Verification

• production Kustomize overlay renders exactly one ScaledJob named github-runners
• rendered runner label remains self-hosted-ubuntu
• all coordinator, runner-image, and prepared-image replacements resolve
• git diff --check passes

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📥 Commits

Reviewing files that changed from the base of the PR and between 6888e85 and e41d4ae.

📒 Files selected for processing (12)

• .github/actionlint.yaml
• .github/workflows/deploy-github-runners.yaml
• src/github-runner/Dockerfile
• src/github-runner/coordinator/src/coordinator.rs
• src/github-runner/coordinator/src/github.rs
• src/github-runner/infra/kustomize/base/kustomization.yaml
• src/github-runner/infra/kustomize/base/scaledjob-sandbox.yaml
• src/github-runner/infra/kustomize/base/scaledjob-single.yaml
• src/github-runner/infra/kustomize/base/scaledjob.yaml
• src/github-runner/run-sandbox.sh
• src/github-runner/run-with-dockerd.sh
• src/github-runner/run.sh

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