Datacenter Picker: Minor UI tweaks and soft-launch

[danielbachhuber]

See https://github.com/Automattic/dotcom-forge/issues/1239

Proposed Changes

1. Uses US West, etc. as the labels, per feedback pdKhl6-15J-p2#comment-1472
2. Only shows the primary data center in 'Web Server Settings' when it was chosen, and displays as a text input pdKhl6-15J-p2#comment-1479
3. Removes the feature flag for a soft launch.

Testing Instructions

1. Create a new WordPress.com site with a business plan.
2. Navigate to 'Hosting Configuration' and click 'Activate'.
3. Verify the <EligibilityWarnings> component displays with the Data Center Picker UI.
4. Verify the Data Center Picker UI is usable, accessible, and looks good in the browsers we support.
5. Click 'Continue' and wait for the site to go Atomic.
6. Look at the 'Web Server Settings' UI and verify it appears as expected.

[github-actions]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:commit-fa55bde088c54b95c169cfe873f2c3d7d9ecedad

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:commit-fa55bde088c54b95c169cfe873f2c3d7d9ecedad&env=jetpack

[matticbot]

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

Sections (~14 bytes removed 📉 [gzipped])

name                             parsed_size           gzip_size
hosting                               -237 B  (-0.0%)      -14 B  (-0.0%)
themes                                 -36 B  (-0.0%)      -17 B  (-0.0%)
settings-performance                   -36 B  (-0.0%)      -17 B  (-0.0%)
plugins                                -36 B  (-0.0%)      -17 B  (-0.0%)
jetpack-cloud-plugin-management        -36 B  (-0.0%)      -17 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.

[a8ci18n]

This Pull Request is now available for translation here: https://translate.wordpress.com/deliverables/7649928

Thank you @danielbachhuber for including a screenshot in the description! This is really helpful for our translators.

[a8ci18n]

Translation for this Pull Request has now been finished.