Description of problem:

The agent-based installer does not support the TechPreviewNoUpgrade featureSet, and by extension nor does it support any of the features gated by it. Because of this, there is no warning about one of these features being specified - we expect the TechPreviewNoUpgrade feature gate to error out when any of them are used.

However, we don't warn about TechPreviewNoUpgrade itself being ignored, so if the user does specify it then they can use some of these non-supported features without being warned that their configuration is ignored.

We should fail with an error when TechPreviewNoUpgrade is specified, until such time as AGENT-554 is implemented.