wp-env: Add lifecycleScripts to the schema

[srtfisher]

What?

Adds the lifecycleScripts configuration option to the JSON schema.

Why?

So that projects that use the schema can properly use the lifecycleScripts property.

How?

Testing Instructions

Testing Instructions for Keyboard

Screenshots or screencast

Before	After

[github-actions]

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[github-actions]

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[t-hamano]

Thanks for the PR!

As mentioned in the comments, this setting should only be available in the root. This PR allows this setting in the environment object.:

Can we move this schema around here?