fix(material/form-field): support signal forms in MatFormFieldControl - #33850
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Updates `MatFormFieldControl` to allow an `ngField` property for those directives that support signal forms. It also makes the following changes: * Removes `value` since it isn't used anywhere and it can prevent apps from implementing `FormValueControl`. * Makes `stateChanges` optional since it shouldn't be necessary for signal-based components. * Allows `focused` to be a signal. * Allows `empty` to be a signal. * Allows `shouldLabelFloat` to be a signal. * Allows `required` to be a signal. * Allows `disabled` to be a signal. * Allows `errorState` to be a signal. * Allows `autofilled` to be a signal. * Allows `userAriaDescribedBy` to be a signal.
Rewrites the custom form field guide and related example to be based on signal forms.
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Updates
MatFormFieldControlto allow anngFieldproperty for those directives that support signal forms. It also makes the following changes:valuesince it isn't used anywhere and it can prevent apps from implementingFormValueControl.stateChangesoptional since it shouldn't be necessary for signal-based components.focusedto be a signal.emptyto be a signal.shouldLabelFloatto be a signal.requiredto be a signal.disabledto be a signal.errorStateto be a signal.autofilledto be a signal.userAriaDescribedByto be a signal.