Bootstrap HtmlOutputLogger from phpunit.xml

We will need a change record as anyone with a custom phpunit.xml will need to add this.

I wonder if we should configure it with the extension configuration instead of using environment variables, or perhaps support both methods?

Let's also let @alexpott confirm that this solves the problem he found with paratest.

+1 on adding config parameters in the xml, and deprecating the two environment variables.

Re: the change record and custom phpunit.xml, I wonder if we can detect from bootstrap.php or elsewhere that the extension is not loaded, and print some kind of notice.

I've tried #7 for deprecating BROWSERTEST_OUTPUT_VERBOSE, although one may argue this is not really a deprecation since there is no point release using it yet.

Deprecating BROWSERTEST_OUTPUT_DIRECTORY is somehow more complicated, since its value is set dynamically in code by PhpUnitTestRunner - for testing purposes and to determine realpath. I'd rather try do that in a follow-up.

++ this works great and fixes running Drupal tests using paratest. We should definitely do this. Thanks @mondrake.

I've applied this fix to #3452524: Fix tests on 11.x due to PHPUnit 10 → and it works great. See https://git.drupalcode.org/project/distributions_recipes/-/jobs/1822778 for a successful run using paratest.

Let's see if I can please everyone with the following:
1. Let's have xml parameters for output directory and verbose, with defaults. Verbose = true
2. Let's keep the two env variables as overrides of the xml parameters, if they exist (i.e. no more deprecation)

This way we combine both worlds, and on CI we do not have to tamper with the xml file.

On that.

Added a draft CR.

This looks fantastic - nice work @mondrake

Raising this to major as it fixes a regression in Drupal 11. The regression is the ability to use paratest - which works great on D10. I think with this change and the move of deprecation reporting to PHPUnit it might be finally possible to consider removing run-tests.sh in favour of paratest which would be quite amazing.

Once this is in, the main CR for PHPUnit 10 will need adjustment.

The Needs Review Queue Bot → tested this issue. It no longer applies to Drupal core. Therefore, this issue status is now "Needs work".

This does not mean that the patch necessarily needs to be re-rolled or the MR rebased. Read the Issue Summary, the issue tags and the latest discussion here to determine what needs to be done.

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Rebased, only context changes