fix(label): do not grow when in end slot (#29036)

Issue number: resolves #29033

---------

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issue. -->

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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/28773 I resolved
several incorrect behaviors with Items related to text wrapping.
However, it looks like I missed the removal of
https://github.com/ionic-team/ionic-framework/pull/28146/files#diff-4a1156704dbf45b0dad273b6909b190ca45e4380aa7378ba88d0dd7d48d7d473R37
which caused the issue to persist when adding a label to the end slot.

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

- Removed logic that caused `ion-label` to grow larger than it needed to
be

| `main` | branch |
| - | - |
| ![Screenshot 2024-02-13 at 11 20
43 AM](https://github.com/ionic-team/ionic-framework/assets/2721089/3fbddd04-d4b5-474c-ab9c-4d9c6e88f758)
| ![Screenshot 2024-02-13 at 11 21
17 AM](https://github.com/ionic-team/ionic-framework/assets/2721089/188eda24-ec6f-4ba7-b3ed-2993d93b1cc7)
|

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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  2. Update the BREAKING.md file with the breaking change.
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## Other information

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

Dev build: `7.7.2-dev.11707840956.16e27b4c`

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

core/src/components/label/label.scss

@@ -29,14 +29,6 @@
   overflow: hidden;
 }
 
-// TODO(FW-5289): move to :host-context(.item)
-// Shouldn't need :not(.item-input) as this was
-// only needed because of the specificity with
-// :not(.item-legacy)
-:host-context(.item:not(.item-input):not(.item-legacy)) {
-  flex-grow: 1;
-}
-
 :host(.ion-color) {
   color: current-color(base);
 }

core/src/components/label/test/item/item.e2e.ts

@@ -0,0 +1,27 @@
+import { expect } from '@playwright/test';
+import { configs, test } from '@utils/test/playwright';
+
+configs({ directions: ['ltr'] }).forEach(({ title, screenshot, config }) => {
+  test.describe(title('label: in item'), () => {
+    test('should render correctly in an item', async ({ page }) => {
+      test.info().annotations.push({
+        type: 'issue',
+        description: 'https://github.com/ionic-team/ionic-framework/issues/29033',
+      });
+      await page.setContent(
+        `
+        <ion-item>
+          <ion-label slot="start">Start</ion-label>
+          <ion-label>Default</ion-label>
+          <ion-label slot="end">End</ion-label>
+        </ion-item>
+        `,
+        config
+      );
+
+      const item = page.locator('ion-item');
+
+      await expect(item).toHaveScreenshot(screenshot(`label-item`));
+    });
+  });
+});