[aws] add ignore_failure: true for uri_parts processor in s3access data stream

[kaiyan-sheng]

Proposed commit message

S3 access log can include request paths that uri_parts processor cannot parse, such as /[[...optional]]. This change sets ignore_failure: true on the uri_parts step so parsing continues even though uri_parts failed.

With this change, aws.s3access.request_uri and related fields remain available, and ECS url.* is only populated when the path is parseable.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.
• I have verified that any added dashboard complies with Kibana's Dashboard good practices

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