Add Cockpit process instance jobs tab

[hauptmedia]

Summary

• add a runtime job API resource for process-instance scoped jobs
• add historic job-log support for process instance history mode
• replace the process instance Jobs placeholder with a live/history jobs table and localized labels

Reference

• Camunda 7 REST API: https://docs.camunda.org/rest/camunda-bpm-platform/7.24/

Verification

• node -e "JSON.parse(require('fs').readFileSync('public/locales/en-US/translation.json','utf8')); JSON.parse(require('fs').readFileSync('public/locales/de-DE/translation.json','utf8'));"
• npx eslint src/api/engine_rest.jsx src/api/resources/job.js src/api/resources/job.test.js src/api/resources/history.js src/api/resources/history.test.js src/pages/Processes.jsx src/pages/Processes.test.jsx src/state.js src/state.test.js
• npx vitest run src/api/resources/job.test.js src/api/resources/history.test.js src/state.test.js src/pages/Processes.test.jsx
• npx vitest run --maxWorkers=4
• npm run build
• browser smoke at http://127.0.0.1:5173/processes/proc:1/instances/inst-9999/jobs: reached login boundary with no console errors

[sonarqubecloud]

Quality Gate failed

Failed conditions
8.9% Duplication on New Code (required ≤ 3%)

See analysis details on SonarQube Cloud