[PHP 7.3] Fix EnvironmentTest::providerTestCheckMemoryLimit() notice

Why isn't EnvironmentTest::providerTestCheckMemoryLimit() failing on the DrupalCI when PHP 7.3 runs against HEAD?

Lol I know why. This test is very bogus. On DrupalCI the CLI limit is likely the same as my local - it's -1 to $twice_avail_memory gets set to -2MB which is nonsense. I think we should replace $twice_avail_memory with 3000000YB cause that is absurd.

Looks good :)

Committed and pushed e57c4a13e6 to 8.7.x and 7041c1c520 to 8.6.x. Thanks!

1. +++ b/core/tests/Drupal/Tests/Component/Utility/EnvironmentTest.php
   @@ -44,14 +44,11 @@ public function testCheckMemoryLimit($required, $custom_memory_limit, $expected)
          // Exceed a custom (unlimited) memory limit.
   

   Let's change this to // Test an unlimited memory limit.

2. +++ b/core/tests/Drupal/Tests/Component/Utility/EnvironmentTest.php
   @@ -44,14 +44,11 @@ public function testCheckMemoryLimit($required, $custom_memory_limit, $expected)
   diff --git a/sites/default/default.services.yml b/sites/default/default.services.yml
   
   diff --git a/sites/default/default.services.yml b/sites/default/default.services.yml
   old mode 100644
   new mode 100755
   diff --git a/sites/default/default.settings.php b/sites/default/default.settings.php
   
   diff --git a/sites/default/default.settings.php b/sites/default/default.settings.php
   old mode 100644
   new mode 100755
   

   This shouldn't be here...

Fixed this all on commit.