Remove ContainerAwareInterface from DrupalKernelInterface

DrupalKernel::initializeContainer() does this:

    // If we haven't booted yet but there is a container, then we're asked to
    // boot the container injected via setContainer().
    // @see \Drupal\KernelTests\KernelTestBase::setUp()
    if (isset($this->container) && !$this->booted) {
      $container = $this->container;
    }

but KernelTestBase::setUp() hasn't called setContainer() since 2017: #2880911: Remove unused KernelTestBase::getCompiledContainerBuilder() →

Maybe this is just dead code?

Looks like this is no longer useful.

I think it's good clean-up of deadcode but interface change needs CR

Added https://www.drupal.org/node/3424376 → though I think it is super unlikely anyone will be affected by this, it was only added for KernelTestBase and is unused now for over six years.

Thank you! Looks nothing to add)

Committed/pushed to 11.x, thanks!

As dead code IMHO this can go back to 10.3.x.

It could if it cherry-picked, but it doesn't - and didn't seem worth spending the effort to backport it.

This was only fixed in 11.x

And published the CR

Automatically closed - issue fixed for 2 weeks with no activity.