[refactor] Centralize batch ingestion job spec constants into SegmentGenerationJobUtils#18413

Akanksha-kedia wants to merge 1 commit intoapache:masterapache/pinot:masterfrom

Akanksha-kedia:centralize-batch-ingestion-job-spec-constantsAkanksha-kedia/pinot:centralize-batch-ingestion-job-spec-constantsCopy head branch name to clipboard