Editor: Add option to ignore sticky posts in Query block

[Mamaduka]

Introduce a new ignore value for the sticky query argument. When this value is used, the query will not prepend sticky posts at the top but display them in the natural order.

Related: #8228
Gutenberg PR: WordPress/gutenberg#69057
Trac ticket: https://core.trac.wordpress.org/ticket/62908#ticket

---

This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.

[github-actions]

The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

Core Committers: Use this line as a base for the props when committing in SVN:

Props mamaduka, peterwilsoncc, audrasjb.

To understand the WordPress project's expectations around crediting contributors, please review the Contributor Attribution page in the Core Handbook.

[github-actions]

Test using WordPress Playground

The changes in this pull request can previewed and tested using a WordPress Playground instance.

WordPress Playground is an experimental project that creates a full WordPress instance entirely within the browser.

Some things to be aware of

• The Plugin and Theme Directories cannot be accessed within Playground.
• All changes will be lost when closing a tab with a Playground instance.
• All changes will be lost when refreshing the page.
• A fresh instance is created each time the link below is clicked.
• Every time this pull request is updated, a new ZIP file containing all changes is created. If changes are not reflected in the Playground instance,
  it's possible that the most recent build failed, or has not completed. Check the list of workflow runs to be sure.

For more details about these limitations and more, check out the Limitations page in the WordPress Playground documentation.

Test this pull request with WordPress Playground.

[peterwilsoncc]

A couple of nit picks inline but this looks good to me.

I've taken the liberty of pushing some tests to your branch to ensure each of the settings work as expected. On trunk the tests fail, on this branch they pass.

The trunk results are:

$ ./vendor/bin/phpunit --group 62908
Installing...
Running as single site... To run multisite, use -c tests/phpunit/multisite.xml
Not running ajax tests. To execute these, use --group ajax.
Not running ms-files tests. To execute these, use --group ms-files.
Not running external-http tests. To execute these, use --group external-http.
PHPUnit 9.6.21 by Sebastian Bergmann and contributors.

Warning:       Your XML configuration validates against a deprecated schema.
Suggestion:    Migrate your XML configuration using "--migrate-configuration"!

..F                                                                 3 / 3 (100%)

Time: 00:00.203, Memory: 193.00 MB

There was 1 failure:

1) Tests_Blocks_wpBlock::test_build_query_vars_from_block_query_ignore_sticky_posts
Failed asserting that two arrays are identical.
--- Expected
+++ Actual
@@ @@
     'post_type' => 'post'
     'order' => 'DESC'
     'orderby' => 'date'
-    'post__not_in' => Array &1 ()
+    'post__not_in' => Array &1 (
+        0 => 21
+    )
     'tax_query' => Array &2 ()
-    'ignore_sticky_posts' => 1
 )

/vagrant/wordpress-develop/tests/phpunit/tests/blocks/wpBlock.php:877

FAILURES!
Tests: 3, Assertions: 8, Failures: 1.

[Mamaduka]

Thanks for pushing the tests, @peterwilsoncc 🙇

[audrasjb]

Appart from the couple wpcs issues reported by Peter this looks good to me 👍 Concerning the post__not_in specific concern, this will need to be documented at least in a dev note, but I think an inline comment somewhere would be ideal.

[Mamaduka]

@peterwilsoncc, @audrasjb let me know if this is good to commit.

[audrasjb]

Thanks @Mamaduka 👍

[peterwilsoncc]

Thanks George, this looks good for commit.