[RS-1592] - Changes WAF from Coraza back to ModSecurity.

[mikestephen]

Description

This PR reverts the PR which changed from using ModSecurity to Coraza as the WAF engine. This is being done because WAF with Coraza doesn't currently work and is holding up Enterprise v3.19-EP1.

For PR author

• Tests for change.
• If changing pkg/apis/, run make gen-files
• If changing versions, run make gen-versions

For PR reviewers

A note for code reviewers - all pull requests must have the following:

• Milestone set according to targeted release.
• Appropriate labels:
  • kind/bug if this is a bugfix.
  • kind/enhancement if this is a a new feature.
  • enterprise if this PR applies to Calico Enterprise only.

[CLAassistant]

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[tmjd]

This is no longer needed.