* Update SIEM suppressions doc post migration
Update Cloud SIEM Suppressions migration instructions post deprecation of legacy suppressions
* remove note on log detection
* add log exclusion query
* Update content/en/security/cloud_siem/log_detection_rules.md
* Update content/en/security/suppressions.md
* Update suppressions.md
added back the migration section with the message that it is in progress
* Update content/en/security/suppressions.md
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Co-authored-by: May Lee <[email protected]>
