feat(input): add clearInputIcon property (#29246)

Issue number: resolves #26974

---------

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## What is the current behavior?
<!-- Please describe the current behavior that you are modifying. -->

In https://github.com/ionic-team/ionic-framework/pull/26354 we updated
the clear icon to use an ionicon instead of an hardcoded SVG. This has
made it challenging to customize the icon.

## What is the new behavior?
<!-- Please describe the behavior or changes that are being added by
this PR. -->

- Added `clearInputIcon` property to allow developers to customize the
ionicon used.

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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## Other information

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screenshots of how the component looks before and after the change. -->

core/src/components/input/input.tsx

@@ -92,6 +92,11 @@ export class Input implements ComponentInterface {
    */
   @Prop() clearInput = false;
 
+  /**
+   * The icon to use for the clear button. Only applies when `clearInput` is set to `true`.
+   */
+  @Prop() clearInputIcon?: string;
+
   /**
    * If `true`, the value will be cleared after focus upon edit. Defaults to `true` when `type` is `"password"`, `false` for all other types.
    */
@@ -681,11 +686,13 @@ export class Input implements ComponentInterface {
   }
 
   render() {
-    const { disabled, fill, readonly, shape, inputId, labelPlacement, el, hasFocus } = this;
+    const { disabled, fill, readonly, shape, inputId, labelPlacement, el, hasFocus, clearInputIcon } = this;
     const mode = getIonMode(this);
     const value = this.getValue();
     const inItem = hostContext('ion-item', this.el);
     const shouldRenderHighlight = mode === 'md' && fill !== 'outline' && !inItem;
+    const defaultClearIcon = mode === 'ios' ? closeCircle : closeSharp;
+    const clearIconData = clearInputIcon ?? defaultClearIcon;
 
     const hasValue = this.hasValue();
     const hasStartEndSlots = el.querySelector('[slot="start"], [slot="end"]') !== null;
@@ -784,7 +791,7 @@ export class Input implements ComponentInterface {
                 }}
                 onClick={this.clearTextInput}
               >
-                <ion-icon aria-hidden="true" icon={mode === 'ios' ? closeCircle : closeSharp}></ion-icon>
+                <ion-icon aria-hidden="true" icon={clearIconData}></ion-icon>
               </button>
             )}
             <slot name="end"></slot>

core/src/components/input/test/input.spec.ts

@@ -99,3 +99,19 @@ describe('input: label rendering', () => {
     expect(labelText.textContent).toBe('Label Prop Text');
   });
 });
+
+// https://github.com/ionic-team/ionic-framework/issues/26974
+describe('input: clear icon', () => {
+  it('should render custom icon', async () => {
+    const page = await newSpecPage({
+      components: [Input],
+      html: `
+        <ion-input clear-input-icon="foo" clear-input="true"></ion-input>
+      `,
+    });
+
+    const icon = page.body.querySelector<HTMLIonIconElement>('ion-input ion-icon')!;
+
+    expect(icon.getAttribute('icon')).toBe('foo');
+  });
+});