…)` and `ContainerBuilder::findExcludedServiceIds()` for auto-discovering value-objects (GromNaN)This PR was squashed before being merged into the 7.3 branch.Discussion----------[DependencyInjection] Add `Definition::addExcludedTag()` and `ContainerBuilder::findExcludedServiceIds()` for auto-discovering value-objects| Q             | A| ------------- | ---| Branch?       | 7.3| Bug fix?      | no| New feature?  | yes| Deprecations? | no| Issues        | -| License       | MITWe could **not** use the method `findTaggedServiceIds` in#59401 (comment), same forapi-platform/core#6943.As "using the container loading tools to do resource discovery quite seamlessly" [seems to be a good idea](#59401 (review)), this changes make it easier.I'm not closed to alternative ideas if we want to go further with this use-case.### UsageLet's create a `AppModel` attribute class and use it on any class of the project.In the extension class:```php$this->registerAttributeForAutoconfiguration(AppModel::class, static function (ChildDefinition $definition) {    $definition->addExcludedTag('app.model');});```In a compiler pass:```php$classes = [];foreach($containerBuilder->findExcludedServiceIds('app.model') as $id => $tags) {    $classes[] = $containerBuilder->getDefinition($id)->getClass();}$containerBuilder->setParameter('.app.model_classes', $classes);```And this parameter can be injected into a service, or directly update a service definition to inject this list of classes. The attribute parameters can be injected into the tag, and retrieved in the compiler pass, for more advanced configuration.Commits-------7a0443b [DependencyInjection] Add `Definition::addExcludedTag()` and `ContainerBuilder::findExcludedServiceIds()` for auto-discovering value-objects