Remove Custom Post Types feature flag

[crazytonyli]

Description

Release custom post types to the public.

When the site has certain custom post types (public, with editor support, etc), they will now show up in the "blog details" screen (My Site -> More for WP.com sites and home screen for self-hosted sites).

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[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress by scanning the QR code below to install the corresponding build.

	App Name	WordPress
	Configuration	Release-Alpha
	Build Number	33524
	Version	PR #25849
	Bundle ID	org.wordpress.alpha
	Commit	c475fda
	Installation URL	5j3qamp47n6k0

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack by scanning the QR code below to install the corresponding build.

	App Name	Jetpack
	Configuration	Release-Alpha
	Build Number	33524
	Version	PR #25849
	Bundle ID	com.jetpack.alpha
	Commit	c475fda
	Installation URL	4p6c50hhb323o

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.