Tests: Don't declare nested named function in Tests_Interactivity_API_wpInteractivityAPIFunctions.

Once the `test_process_directives_when_block_is_filtered()` method has run, the named `test_render_block_data()` function declared nested within becomes part of the global namespace, which could cause problems for other tests.

Quite apart from the fact that the name starting with `test_`  is confusing (as methods prefixed with `test_` are supposed to be test methods to be run by PHPUnit).

Using a closure for this callback fixes the issue. Declared as `static` for a micro-optimization.

Follow-up to [57826].

Props jrf, hellofromTonya.
See #61530.
Built from https://develop.svn.wordpress.org/trunk@58738


git-svn-id: http://core.svn.wordpress.org/trunk@58140 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.7-alpha-58734';
+$wp_version = '6.7-alpha-58738';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.