trend_micro_vision_one: fix detection pipeline marking events as pipeline_error

[efd6]

Proposed commit message

trend_micro_vision_one: fix detection pipeline marking events as pipeline_error

The convert_risk_level_to_long and uri_parts_request processors both
had on_failure handlers that appended to error.message. The pipeline
epilogue marks any document with error.message as pipeline_error, so
events with non-numeric risk levels or malformed URLs were classified
as errors instead of being indexed normally.

Remove the error.message append from convert_risk_level_to_long
(keeping the field removal since the mapping is long) and replace
the uri_parts_request on_failure block with ignore_failure.

Test case was manually constructed based on a report.

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.
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• I have verified that any added dashboard complies with Kibana's Dashboard good practices

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Package trend_micro_vision_one - 2.13.1 containing this change is available at https://epr.elastic.co/package/trend_micro_vision_one/2.13.1/