Update postgresql.yaml to reduce number of Grok Parser Samples #21970
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What does this PR do?
PR removes a log sample from the first Grok Parser of the Postgresql Integration Pipeline.
Grok Parsers allow a maximum of 5 log samples but this Grok Parser currently contains 6 samples. If a user clones this pipeline and edits any processor within it, they will be unable to save changes to the pipeline.
The sample that is removed was listed as the second sample but falls under the same rule as the first sample (default_format)
Motivation
A customer cloned the Postgresql Integration Pipeline recently and was unable to save changes to their clone. The error that was returned read "Creation of processor could not be completed successfully" without additional context.
see https://datadoghq.atlassian.net/browse/LOGSS-9623 for more details.
Review checklist (to be filled by reviewers)
qa/skip-qalabel if the PR doesn't need to be tested during QA.backport/<branch-name>label to the PR and it will automatically open a backport PR once this one is merged