BUILD-11470 Use snake_case keys in cache JSON metrics

[julien-carsique-sonarsource]

Summary

• Renames kebab-case jq field references in ci-metrics/job-completed.sh to snake_case to match the updated CacheMetricsRecord schema from gh-action_cache (BUILD-11470)
• Fields renamed: cache-hit → cache_hit, restore-key-hit → restore_key_hit, size-bytes-restored → size_bytes_restored, size-bytes-at-end → size_bytes_at_end

The file is aligned with the source in https://github.com/SonarSource/github-runners-infra/pull/417
https://github.com/SonarSource/github-runners-infra/blob/8d793a9623327bac9b363dd0d5d8e47d8e17230d/infra/applications/github-runners/hooks/job-completed.sh

Related PRs

Part of BUILD-11470 — three-repo change:

• gh-action_cache — interface + source (pending)
• github-runners-infra — hook + fixtures (pending)
• This PR — copy of the hook in ci-metrics/

Test plan

• Pre-commit hooks passed (ShellCheck)
• Verify cache section renders correctly in $GITHUB_STEP_SUMMARY on a real run

[hashicorp-vault-sonar-prod]

BUILD-11470

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues
0 New dependency risks

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[gitar-bot]

Code Review ✅ Approved

Renames jq field references in the job-completed script to snake_case to align with the updated CacheMetricsRecord schema. No issues found.

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[Copilot]

Pull request overview

Updates the CI metrics runner hook to read cache metrics JSON using the new snake_case field names, aligning the summary rendering with the updated gh-action_cache CacheMetricsRecord schema (BUILD-11470).

Changes:

• Switches jq field accesses from kebab-case to snake_case for cache metrics (cache_hit, restore_key_hit, size_bytes_restored, size_bytes_at_end).

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