Add security trial actions to continuous onboarding

What does this MR do and why?

We believe that we can drive trial-to-paid conversions by presenting high-converting features in the continuous onboarding experience. To verify that, we will add ~5 high-converting trial features to the continuous onboarding experience.

Screenshots or screen recordings

How to set up and validate locally

• Under personal namespace create project with name: Learn GitLab, board: GitLab onboarding and label: Novice

bin/rails c

Feature.enable(:security_actions_continuous_onboarding)
OnboardingProgress.create(namespace: <personal namespace where project was created>)

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to https://gitlab.com/gitlab-org/gitlab/-/issues/345175