Support running tests via GitOps

[dejanzele]

Describe the enhancement you'd like to see
Testkube supports defining tests in a GitOps friendly approach by using the Test & TestSuite CRDs.
Testkube DOES NOT offer a way to run your tests in a GitOps approach on application rollouts.

It would be nice to have an option to define tests and also run them as part of application rollout process.

Additional context
We could either document a process how to run tests by defining a Job which executes already defined tests which could use Helm hooks or ArgoCD hooks, or implement an Execution CRD which would be in charge of triggering a test in a GitOps friendly way.

[exu]

We were discussing some time ago creating Execution CRD. One concern was ETCD performance and we postponed it.

Maybe it's good time to do some PoC for that? @TheBrunoLopes ?

[vsukhin]

Similar to #4017

[TheBrunoLopes]

closing this issue to not be duplicated #4017