feat(avatar): add disabled property (#30284)

Issue number: internal

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## What is the current behavior?
Avatar does not have a disabled state for the ionic theme.

## What is the new behavior?
- Added styles for ionic theme disabled state
- Added states e2e test & snapshots

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

## Other information

<!-- Any other information that is important to this PR such as
screenshots of how the component looks before and after the change. -->

[Preview](https://ionic-framework-git-rou-11728-ionic1.vercel.app/src/components/avatar/test/states?ionic:theme=ionic)

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Co-authored-by: Brandy Smith <brandyscarney@users.noreply.github.com>
Co-authored-by: ionitron <hi@ionicframework.com>

packages/angular/src/directives/proxies.ts

@@ -211,14 +211,14 @@ export declare interface IonApp extends Components.IonApp {}
 
 
 @ProxyCmp({
-  inputs: ['mode', 'shape', 'size', 'theme']
+  inputs: ['disabled', 'mode', 'shape', 'size', 'theme']
 })
 @Component({
   selector: 'ion-avatar',
   changeDetection: ChangeDetectionStrategy.OnPush,
   template: '<ng-content></ng-content>',
   // eslint-disable-next-line @angular-eslint/no-inputs-metadata-property
-  inputs: ['mode', 'shape', 'size', 'theme'],
+  inputs: ['disabled', 'mode', 'shape', 'size', 'theme'],
 })
 export class IonAvatar {
   protected el: HTMLIonAvatarElement;