* [AI] fix(memory): add batch completed and batch failed logs for embedding ops
The embedBatchWithRetry function logged 'batch start' but never logged
'batch completed' or 'batch failed' after the embedding batch call,
leaving operators with no post-request feedback. When batches hang or
time out, only 'batch start' appears in logs with no diagnostic signal.
Add 'batch completed' log after runEmbeddingOperationWithTimeout success
and 'batch failed' log in the catch handler. This is an observability
improvement, not a functional fix for the underlying hang (#93312).
Related to #93312
* [AI] fix(memory): use formatErrorMessage for embedding batch error log
Replace String(err) with formatErrorMessage(err) in the batch failed
catch handler to redact sensitive provider error text (e.g. API keys
and tokens embedded in error messages) before logging.
Related to #94732
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Co-authored-by: Vincent Koc <vincentkoc@ieee.org>
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