[pkg/stanza] `syslog` operator should not split batches of entries

[andrzej-stencel]

Component(s)

pkg/stanza

Is your feature request related to a problem? Please describe.

With the introduction of batching in File consumer in #35455, Stanza operators can now receive a batch of entries for processing, instead of single entries. Most Stanza operators already correctly process batches of entries without splitting them, as implemented in #39575. The syslog operator is one of the few operators that still split batches of entries, which has a negative impact on performance.

Describe the solution you'd like

The syslog operator should process batches of entries without splitting the batches.

Describe alternatives you've considered

No response

Additional context

No response

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Pinging code owners:

• pkg/stanza: @andrzej-stencel

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