[TrendAI Deep Security] Map CEF Name to trendmicro.deep_security.malware.name for anti-malware events

[moxarth-rathod]

Proposed commit message

trendmicro: map CEF Name to dedicated malware name field for anti-malware events

Map the CEF Name value to trendmicro.deep_security.malware.name for anti-malware
events so malware and threat classifications remain searchable when deviceAction
overwrites event.action and duplicate-field cleanup removes trendmicro.deep_security.name.

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

How to test this PR locally

Related issues

• Closes Trend Micro Deep Security: map CEF Name to a dedicated malware name field for anti-malware events #18660

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✅ All changelog entries have the correct PR link.

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cc @moxarth-rathod

[efd6]

The issue in the description is not correct. Can you fix that? It should be #18660 AFAICS.

After that, LGTM

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Package trendmicro - 2.9.0 containing this change is available at https://epr.elastic.co/package/trendmicro/2.9.0/