Onboarding: allow hiding free plan on 2023 pricing grid

[zaguiini]

On #75424, we're fixing the bug that prevented the free plan from being hidden. However, we missed removing the gate behind the hideFreenPlan variable. This PR opens the gate since the issue is fixed.

[github-actions]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-62829

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-62829&env=jetpack

[matticbot]

Here is how your PR affects size of JS and CSS bundles shipped to the user's browser:

Sections (~25 bytes removed 📉 [gzipped])

name    parsed_size           gzip_size
signup        -82 B  (-0.0%)      -25 B  (-0.0%)

Sections contain code specific for a given set of routes. Is downloaded and parsed only when a particular route is navigated to.

Legend

What is parsed and gzip size?

Parsed Size: Uncompressed size of the JS and CSS files. This much code needs to be parsed and stored in memory.
Gzip Size: Compressed size of the JS and CSS files. This much data needs to be downloaded over network.

Generated by performance advisor bot at iscalypsofastyet.com.

[claudiucelfilip]

@zaguiini Thanks for catching this! However, this change will remove the Free plan if the user selects Choose my domain later on the domains step.
This behavior (to keep the Free plan) has been introduced here because of the missing features issue, but it's also an intended behavior, with the main onboarding flow at least.
The situation is being tackled in this thread: p9Jlb4-6HH-p2.

[zaguiini]

Oh, I see, @claudiucelfilip, so that's actually intended behavior. Let me close this PR then!