e2e: simplify failure-list join to bash param expansion

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toothbrush3mo ago

Replace the tr|sed|paste|sed pipeline with leading-space strip + ", " substitution. Same output for empty/single/multi; less to read.

Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com Entire-Checkpoint: 1ec42020fb6a

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Simplify E2E Failure List Join

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