Ability to disable certain example manifest generation

### What problem are you facing?

In many cases, there is a single unified manifest for the whole group and then the dependent manifests are also repeated in other single YAML examples. In some cases, the manifest is different than the one used in the unified example. Our goal is to have the least examples for a kind in the beginning to reduce the toil, hence we'd like to disable generation of these additional examples when we see those kinds already have examples in the unified YAML.

### How could Terrajet help solve your problem?

If the removal of an example from `.MetaResource` does not exclude it from reference config generation, then a helper function should be sufficient. However, if it does have an impact, then a configuration field that will disable only write operation of the manifest would be needed.