Update PHPUnit stubs to PHPUnit 11.5 (#42591)

This needs some changes to the munger:

* `@psalm-` annotations seem mostly replaced with `@phpstan-`.
* Some bad phpdocs have been fixed.

This also calls for some cleanups of things deprecated or removed in
PHPUnit 11:

* `MockBuilder->addMethods()` is deprecated with no replacement. We
  often used this to "mock" stdClass; now, instead, we need to either
  use anonymous classes or mock a dummy interface.
* `->getMockForAbstractClass()` is also deprecated. Can be replaced with
  `->onlyMethods( ... )->getMock()` but we have to manually list the
  needed methods.
* `->getMockForTrait()` as well. Anonymous classes work well here.
* `TestCase->returnValue()` is deprecated in favor of
  `$double->willReturn()`.
* `TestCase->addWarning()` is gone. Seems to work replacing it with
  `trigger_error( E_USER_WARNING )`.
* packages/masterbar: `Base_Admin_Menu_Test` has some of the same
  weirdness `WPcom_Admin_Menu_Test` did before #42504, just less
  obviously so.
* plugins/jetpack: `Jetpack_Client_Server_Test` seems to have been
  creating unused mocks since #14043. Removed them.

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/13956378052

Upstream-Ref: Automattic/jetpack@281a100

Author: anomiex

composer.lock

@@ -10,7 +10,7 @@
     ),
     'jetpack-assets' => array(
       'path' => 'jetpack_vendor/automattic/jetpack-assets',
-      'ver' => '4.0.14-alpha1742415897',
+      'ver' => '4.0.14-alpha1742417137',
     ),
     'jetpack-blaze' => array(
       'path' => 'jetpack_vendor/automattic/jetpack-blaze',
@@ -30,7 +30,7 @@
     ),
     'jetpack-connection' => array(
       'path' => 'jetpack_vendor/automattic/jetpack-connection',
-      'ver' => '6.7.7-alpha1742415897',
+      'ver' => '6.7.7-alpha1742417137',
     ),
     'jetpack-google-analytics' => array(
       'path' => 'jetpack_vendor/automattic/jetpack-google-analytics',
@@ -46,7 +46,7 @@
     ),
     'jetpack-masterbar' => array(
       'path' => 'jetpack_vendor/automattic/jetpack-masterbar',
-      'ver' => '0.14.2-alpha1742415897',
+      'ver' => '0.14.2-alpha1742417137',
     ),
     'jetpack-mu-wpcom' => array(
       'path' => 'jetpack_vendor/automattic/jetpack-mu-wpcom',
@@ -62,7 +62,7 @@
     ),
     'jetpack-stats' => array(
       'path' => 'jetpack_vendor/automattic/jetpack-stats',
-      'ver' => '0.15.8-alpha1742415897',
+      'ver' => '0.15.8-alpha1742417137',
     ),
     'jetpack-stats-admin' => array(
       'path' => 'jetpack_vendor/automattic/jetpack-stats-admin',