CLI: generate command should assume little Jetpack awareness

`jetpack generate` asks if the user wants to add WorDBless for integration testing. WorDBless is not a well-known tool and is a confusing question for someone not well-aware of what we offer.

We should ask something like `Would you like to have WordPress available to your integration testing` or something like that.

Generally, we should audit the strings used in questions to increase ease of use to first-time or rare contributors.

Suggested by @dereksmart

Start with the `jetpack generate` command and locate the question that mentions WorDBless. Review the surrounding user-facing questions for similarly unfamiliar terminology, then update the wording so users understand that WordPress will be available for integration testing. Done means the generate prompts are clearer for first-time or rare contributors.

Written by the indexing model from the issue text.