fix: safari no longer adjusts text in landscape (#27787)

Issue number: resolves #27782

---------

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issue. -->

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

Ionic uses text-size-adjust to prevent browsers from resizing text in
landscape mode in order to match native app behavior. However, WebKit
only supports `-webkit-text-size-adjust`, so this fix never applied to
iOS devices.

https://caniuse.com/?search=text-size-adjust

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

- Add `-webkit-text-size-adjust` where we use `text-size-adjust`

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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and migration path for existing applications below. -->


## Other information

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

**Landscape**

| main | branch |
| - | - |
|
![IMG_0046](https://github.com/ionic-team/ionic-framework/assets/2721089/d719f495-c051-4f64-a6fa-f17435c68cb5)
|
![IMG_0048](https://github.com/ionic-team/ionic-framework/assets/2721089/7a0b5f45-b72a-466d-8e00-846de2572e49)
|

**Portrait** (Should be no changes)

| main | branch |
| - | - |
|
![IMG_0045](https://github.com/ionic-team/ionic-framework/assets/2721089/a2324f9f-efcc-4c75-8359-2441f93ceadc)
|
![IMG_0047](https://github.com/ionic-team/ionic-framework/assets/2721089/64566645-5778-435f-a511-5fe7234c7f65)
|

core/src/css/structure.scss

@@ -17,6 +17,7 @@
 html {
   width: 100%;
   height: 100%;
+  -webkit-text-size-adjust: 100%;
 
   text-size-adjust: 100%;
 }
@@ -80,6 +81,7 @@ body {
   word-wrap: break-word;
 
   overscroll-behavior-y: none;
+  -webkit-text-size-adjust: none;
 
   text-size-adjust: none;
 }