TypeScript: Add env type to BuilderOptions

[IanVS]

Closes #

Ref: #17862 (comment)

What I did

I could see that both builders use options.presets.apply<Record<string, string>>('env'), but as reported, we did not include env in our TS types. This adds it to BuilderOptions.

How to test

Reference env in the config of a TypeScript sandbox.

Checklist

• Make sure your changes are tested (stories and/or unit, integration, or end-to-end tests)
• Make sure to add/update documentation regarding your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Maintainers

• If this PR should be tested against many or all sandboxes,
  make sure to add the ci:merged or ci:daily GH label to it.
• Make sure this PR contains one of the labels below.

["cleanup", "BREAKING CHANGE", "feature request", "bug", "documentation", "maintenance", "dependencies", "other"]

[IanVS]

I'm not familiar with the Angular setup, and not sure the best way to fix the type error there.