Themes: Include delisted when searching

[zaguiini]

Closes #94310.

Before	After

Why are these changes being made?

Delisted themes were not being included in search, causing a mismatch with the Dotorg API and categorizing some free themes as 3rd-party that requires a paid site.

Testing Instructions

1. Apply D162217-code and proxy your sandbox
2. Search for 2011 and eleven and make sure it shows up as a free theme instead of requiring an Upgrade

[github-actions]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-120339

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-120339&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-120339&env=a8c-for-agencies

[matticbot]

This PR modifies the release build for the following Calypso Apps:

For info about this notification, see here: PCYsg-OT6-p2

• notifications

To test WordPress.com changes, run install-plugin.sh $pluginSlug themes/include-delisted-when-searching on your sandbox.

[matticbot]

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

Sections (~12 bytes added 📈 [gzipped])

name                     parsed_size           gzip_size
themes                         +12 B  (+0.0%)       +4 B  (+0.0%)
theme                          +12 B  (+0.0%)       +4 B  (+0.0%)
readymade-template-flow        +12 B  (+0.0%)       +3 B  (+0.0%)
marketplace                    +12 B  (+0.0%)       +4 B  (+0.0%)
checkout                       +12 B  (+0.0%)       +5 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.

Async-loaded Components (~4 bytes added 📈 [gzipped])

name                                     parsed_size           gzip_size
async-load-signup-steps-theme-selection        +12 B  (+0.0%)       +4 B  (+0.0%)
async-load-design-blocks                       +12 B  (+0.0%)       +4 B  (+0.0%)

React components that are loaded lazily, when a certain part of UI is displayed for the first time.

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.

[dsas]

This works for me for the twentyeleven theme. The behaviour in general matches the FG now (PCYsg-S9k-p2).

CC @Automattic/lego as the people who worked on delisting originally.

[taipeicoder]

LGTM 👍