Secrets MVC Research Spike: Allow user to install Hashicorp Vault into Kubernetes Cluster
### Problem to solve
In the [Category Vision for Secrets Management](https://about.gitlab.com/direction/release/secrets_management/), we are invested in making HashiCorp's Vault Easy to Use with GitLab. For the ~"group::release management", we have the next step of enabling users to install Vault on Kubernetes Cluster in #9982. Before this can be done, we need to research the implementation of #28321 and also #20306
### Intended users
* [Delaney (Development Team Lead)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#delaney-development-team-lead)
* [Sasha (Software Developer)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#sasha-software-developer)
* [Devon (DevOps Engineer)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#devon-devops-engineer)
### Proposal/Action Plan
* [ ] Investigate and learn the instrumentation of #28321 completed by the Verify Team
* [ ] Iterate on #9982 until scope is clear enough to build
* [ ] Define iteration 1 of the MVC
### Documentation
* https://gitlab.com/gitlab-org/gitlab/issues/28321
### What does success look like, and how can we measure that?
* We have a defined implementation path to have users installing HashiCorp Vault on Kube Cluster in #9982
* New Issues created have weights
* Reach Minimal by 12.8
issue