chore(input): remove generated documentation for size attribute (#27951)

Issue number: Resolves #27945 

---------

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## What is the current behavior?
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The `ion-input` accepts a `size` attribute that implies that it will
effect the size of the input under certain rules. This is not the case.
The `size` attribute has no effect on the size of the `input` element
since Ionic sets the input width to 100%.

## What is the new behavior?
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this PR. -->

- Removes the documentation around the `size` attribute so that it will
be removed from the Ionic Docs
- Adds a task link to remove the `size` attribute in an upcoming major
release

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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and migration path for existing applications below. -->


## Other information

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

core/src/components/input/input.tsx

@@ -268,9 +268,7 @@ export class Input implements ComponentInterface {
    */
   @Prop() step?: string;
 
-  /**
-   * The initial size of the control. This value is in pixels unless the value of the type attribute is `"text"` or `"password"`, in which case it is an integer number of characters. This attribute applies only when the `type` attribute is set to `"text"`, `"search"`, `"tel"`, `"url"`, `"email"`, or `"password"`, otherwise it is ignored.
-   */
+  // FW-4914 Remove this property in Ionic 8
   @Prop() size?: number;
 
   /**