fix(item): label does not expand indefinitely (#28700)

Issue number: N/A

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## What is the current behavior?
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While working on an unrelated task, I noticed the list items in the list
starter app run off the page. This is due to the text wrapping behavior
in v7.6 where we allows the labels to grow/shrink. However, we do not
set a limit on how much they can grow. This means that child elements
inside of `ion-label` with long text can cause the label container to
grow indefinitely.

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

- Labels in item have a max-width of 100%

## 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. -->

Dev build: `7.6.1-dev.11702498225.1ad6eda6`

| before | after |
| - | - |
| ![localhost_8102_home(Samsung Galaxy
S8+)](https://github.com/ionic-team/ionic-framework/assets/2721089/cadf8c5f-5813-4c8d-b236-752fde3d37cc)
| ![localhost_8102_home(Samsung Galaxy S8+)
(1)](https://github.com/ionic-team/ionic-framework/assets/2721089/ccb4277c-046d-46f8-b7f8-eda63c72fdb9)
|

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Co-authored-by: ionitron <hi@ionicframework.com>

core/src/components/item/item.scss

@@ -426,6 +426,13 @@ button, a {
   // shrink and wrap its text instead of moving to its
   // own row if there are slotted elements next to it
   width: min-content;
+
+  /**
+   * We allow labels in the default
+   * slot to grow. However, we do not
+   * want them to grow indefinitely.
+   */
+  max-width: 100%;
 }
 
 // Item Input