DOCS-533 - Network sensor end-of-life

[jpipkin1]

Purpose of this pull request

This pull request:

• Adds a release note
• Updates this article: https://help.sumologic.com/docs/cse/ingestion/ingestion-sources-for-cloud-siem/corelight-zeek/
• Removes this article: https://help.sumologic.com/docs/cse/sensors/
• Removes these articles from the left nav (they will be removed completely by another PR):
  • https://help.sumologic.com/docs/cse/sensors/ingest-zeek-logs/
  • https://help.sumologic.com/docs/cse/sensors/sensor-download-locations/
  • https://help.sumologic.com/docs/cse/sensors/network-sensor-deployment-guide/
  • https://help.sumologic.com/docs/cse/sensors/network-sensor-troubleshooting/
  • https://help.sumologic.com/docs/cse/sensors/log-sensor-troubleshooting/

Select the type of change

• [ ] Minor Changes - Typos, formatting, slight revisions
• [x] Update Content - Revisions, updating sections
• [ ] New Content - New features, sections, pages, tutorials
• [ ] Site and Tools - .clabot, version updates, maintenance, dependencies, new packages for the site (Docusaurus, Gatsby, React, etc.)

Ticket (if applicable)

DOCS-533

[soc-service-agent]

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