[docs] Add missing page-level applies_to to exported fields pages (#46527)

* update logic

* add missing page-level applies_to to auditbeat ga exported fields

* add missing page-level applies_to to filebeat ga exported fields

* add missing page-level applies_to to heartbeat ga exported fields

* add missing page-level applies_to to metricbeat ga exported fields

* add missing page-level applies_to to packetbeat ga exported fields

* add missing page-level applies_to to winlogbeat ga exported fields

* clean up

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Co-authored-by: Francisco Ramon <[email protected]>

Author: colleenmcginnis