Regenerate all the e2e expect json files

What does this MR do?

Regenerating the expected JSON for the DAST end-to-end tests is hard and is labour intensive. This MR hopes to make this task trivial by adding the test.regenerate-e2e-expected-json invoke task. The task clears the output directory, builds both dast and dast-future and then runs all of the end-to-end tests. It then "cleans" those json files and copies them to the expect directory with the correct name.

This is especially useful at the moment since the end-to-end tests will need to be regenerated a number of times. First when Aggregate noisy DAST vulnerabilities into a single vulnerability is turned on by default and then when DAST v2 is released.

What are the relevant issue numbers?

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated for GitLab EE, if necessary
• Documentation created/updated for this project, if necessary
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Job definition updated, if necessary
  • Job definition example
  • Vendored CI Templates (also in CE)
• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer