Produce json security report in production

Problem

API Fuzzer can generate security vulnerability reports, but it's not enabled in production.

Second half to #224726 (closed)

This work must be done after the frontend work has been completed.

Proposal

Enable security report generation in production.

1. The worker-entry is updated to generate report
2. The gitlabpoc is modified to support the new report method
3. Update template
4. Update documentation
   • Address #285474 (closed)
   • User documentation
5. Add tests
6. Verify report generated when no faults found

On completion of testing, produce a json report suitable for the security dashboard. The fuzzer results will show up on the security dashboard, and not as junit results.

/cc @sethgitlab @stkerr

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