Move clientside assumptions about prop form data shape into a series of prop specific transforms

This will result in a critical update to docs/redux-integrated-field-widgets.md that 🐛 Experiments in rendering Twig as React Active introduced, and I expect this to make that table more complete and more green/yellow, less red! 🥳

AFAICT this is also a pre-requisite to be able to fix #3500385?

This already looks fantastic! It looks like this will go a long way in making our Redux-integrated field widgets scale to the entire ecosystem, and will allow us to remove a lot of hardcoded shenanigans 😊

Detailed feedback on the MR, including suggestions for the questions you left in there.

P.S.: I think this means we'll be able to remove the hacky addition to \Drupal\experience_builder\PropExpressions\StructuredData\Evaluator::evaluate() that 📌 Implement saving block settings forms Active added for the client-side datetime manipulation stuff? 🤞😄

FYI: the remaining e2e test failure in publish-button.cy.js is one we've seen before — e.g. https://git.drupalcode.org/project/experience_builder/-/jobs/4200048 for the Jan 31 test run of HEAD at the time: https://git.drupalcode.org/project/experience_builder/-/commit/2756b20d9...

Yup that test failure is logged at 🐛 publish-button.cy.js test is flaky Active

MR looks good to me, I guess we will find out when contrib/etc starts implementing more of these transformers.

Usually, I'd like the main code owner for , @bnjmnm, to review this.

But:

• @larowlan did the critical front-end pieces of this MR, and he's a fellow code owner of that area
• zero UI tests were changed, which shows this is a pure refactor
• it clearly moves the needle forward, by introducing a needed abstraction that we can continue to refine in the future — it moves logic that was hardcoded in ui/src/components/form/formUtil.ts to ui/src/utils/transforms.ts

@larowlan already updated docs. He also added unit tests.

So: being bold, to gain some much-needed progress on the ~5 month old meta 🐛 Some components cannot be used in XB because UI prevents SDC props being named `name` Active that is still open, of which this resolves one piece 😊

Next up:

1. 📌 Maintain a per-component set of prop expressions/sources Active
2. 📌 Split model values into resolved and raw Active
3. 📌 Support server side massage and validation of component prop form values Active

It looks like this also solved 📌 Discover cases where is no 1:1 map between field, prop and widget values Active ?

I realized while working on subsequent issues that this issue's MR did update docs/redux-integrated-field-widgets.md by adding a new section, but it didn't update the "spectrum" section yet that aims to provide an overview of what's done, what remains etc.

So, created https://git.drupalcode.org/project/experience_builder/-/merge_requests/617 to update it, and make it less bleak 😊

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