feat(input): remove size property in favor of CSS styling (#28903)

Issue number: Internal

---------

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## What is the current behavior?
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The `ion-input` component currently specifies a `size` attribute to
align with the HTML `input` implementation. However, Ionic's custom
appearance for MD and iOS is not compatible and should not be used with
the `size` attribute:
https://github.com/ionic-team/ionic-framework/issues/27945#issuecomment-1669702274.

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

- The `size` property has been removed from `ion-input`.

## Does this introduce a breaking change?

- [x] Yes
- [ ] No

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The `size` attribute has been removed from `ion-input`. As it was not
compatible before, this is likely to have a minimal impact to
developers. If your application is using the `size` attribute, replace
the usage with CSS styling to control the width of the `ion-input`.


## Other information

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

packages/vue/src/proxies.ts

@@ -429,7 +429,6 @@ export const IonInput = /*@__PURE__*/ defineContainer<JSX.IonInput, JSX.IonInput
   'shape',
   'spellcheck',
   'step',
-  'size',
   'type',
   'value',
   'ionInput',