[sunitaprajapati89]

Summary

• `chunk()` assigned into an index, so when the first item alone was >= `maxKB` it left a hole at `chunks[0]`. Since 2.23.0, `aggregateErrors` iterates results with `for...of`, which throws on the resulting `undefined`, so every flush failed and the queue never drained.
• `rollingKBSize` was never reset per chunk, so once exceeded every remaining item became its own batch (e.g. 1200 ~1KB events produced 700 requests instead of 3).
• `chunk()` now appends, always returns a dense array, resets the size accumulator per chunk, and isolates an oversized item in its own batch.

Test plan

• Added tests for oversized first item (dense result) and count limit reachable after size reset
• `jest` for `util` and `plugins` suites passes

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