Add instrumentation tracking of PDF Report usage. Include filesize

As mentioned in this thread, we should track the pdf file sizes in our analytics

Track PDF event for project and group PDF Report

Event: export_pdf_security_dashboard

  1. For project, filter with label: export_pdf_security_dashboard_project
  2. For groups, filter with label: export_pdf_security_dashboard_group

Attributes

  1. file_size
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