e2e test of managed service deployment

[BROngineer]

• Add test of deploying service using ServiceTemplate included into ClusterDeployment

Fixes: #849 #850

[zerospiel]

In general LGTM, a couple of questions/comments, and the PR should be postponed until the e2e CI is ready (as of now and to my understanding it is blocked due to the #871). After addressing the issue, the PR should be then checked with the e2e tests job

[eromanova]

Generally LGTM. One small question:
Should we also test service deployment for other providers or hosted environments? I’m asking because once #752 is implemented, some providers might be skipped, and service deployment may not be checked at all. But, if this code is expected to change soon, it’s fine as is for now.

[BROngineer]

@zerospiel @eromanova @Kshatrix colleagues, e2e tests are flacky. What's especially annoying is that their stability depends on the cloud provider. GH actions history shows, that tests added in this PR passes in case kcm able to deploy the cluster. Pls approve and merge.

[a13x5]

As discussed previously since tests are failing randomly (in other PRs as well) we can't wait indefinitely for the tests to pass.
Merging without green tests. Code itself looks good, but it must be revisited after service templates will be separated to the catalog repo