[PP-2] to_email and similar config keys have schema type email but allow other things

Opened a merge request.

Pipeline with 6.2.x against 10.2.x, everything is failing: https://git.drupalcode.org/issue/webform-3400868/-/jobs/309374

Pipeline with the MR against 10.2.x: not everything is failing: https://git.drupalcode.org/issue/webform-3400868/-/jobs/309454

I expect there might still be some problems, due to the changed field UI for example.

Yep this makes sense

Note that this doesn't update all of these tests forms, there are _dozens_, and still 150+ test fails.

there are _dozens_, and still 150+ test fails.

😬

Let's make it easy to see those: 📌 Test Webform against upcoming 10.2.x on GitLab CI Needs review . The only way that we can be confident that this issue makes all tests pass is if this issue can make those tests green.

Other observations:

1. TESTS SHOULD NEVER HAVE FAILED in the first place. Investigated and … opened a new core critical issue, with a root cause analysis here: #3402168-7: Follow-up for #3361534: config validation errors can still occur for contrib modules, disrupting contrib → .
2. That being said, it looks like the config schema of webform is rather inaccurate, and fixing those inaccuracies is likely to help make the module more stable. It's also likely to result in a better experience for the Config Translation module, for example.

As of #3402168-17: Follow-up for #3361534: Config validation errors can still occur for contrib modules, disrupting contrib → , 📌 Test Webform against upcoming 10.2.x on GitLab CI Needs review is passing all of the 10.2.x tests 👍

With the exception of unrelated failures (for example, WebformStatesHiddenTest and WebformSettingsPreviewTest fail because it's asserting markup literally instead of using CSS selectors, XPath or DOMDocument — probably these output changes are due to 🐛 Upgrade filter system to HTML5 Fixed ). See the results.