Make Trivy the default container scanning analyzer

Why are we doing this work

Klar was deprecated and is being removed in %14.0. The new container-scanning analyzer replaces it.

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Relevant links

Non-functional requirements

• Documentation:
• Feature flag:
• Performance:
• Testing:

Implementation plan

• Update Container-Scanning.gitlab-ci.yml
  1. Rewrite CS_ANALYZER_IMAGE in .cs_common to stop using SECURE_ANALYZERS_PREFIX and CS_MAJOR_VERSION.
  2. Remove SECURE_ANALYZERS_PREFIX and CS_MAJOR_VERSION
  3. Remove container_scanning
  4. Rename container_scanning_new to container_scanning
  5. Amend rules in container_scanning to remove check for CS_MAJOR_VERSION.
• Remove mentions to Klar/Clair from documentation