Tamir Duberstein 4a942885c8
Reduce unified exec output buffer allocations ( #39712 ) ...
## What changed
- Accept borrowed byte slices when appending output chunks, avoiding clones before
forwarding those chunks to streaming consumers.
- Merge drained head-tail buffers by reusing their owned storage while preserving
the retained prefix, latest suffix, and omitted-byte count.
- Make unified exec output handles capacity-generic so bounded-output tests can
exercise repeated drains with small buffers.
## Testing
- Update head-tail buffer and process manager tests to cover chunk retention,
omission accounting, and repeated output drains with the new APIs.
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Tamir Duberstein
4a942885c8