[Bug]: TabsOverflow size does not affect tabs size

### Code of conduct

- [x] I agree to follow this project's code of conduct.

### Impacted component(s)

sp-tabs-overflow

### Expected behavior

Setting the size on sp-tabs-overflow should change the size of its slotted sp-tabs.

Although not explicitly documented in the [Tabs Overflow API](https://opensource.adobe.com/spectrum-web-components/components/tabs-overflow/api/), the TabsOverflow component does [include the SizedMixin](https://github.com/adobe/spectrum-web-components/blob/main/packages/tabs/src/TabsOverflow.ts#L43). There are also [stories](https://opensource.adobe.com/spectrum-web-components/storybook/index.html?path=/story/tabs-overflow-sizes--m&globals=system:express) for TabsOverflow sizes, indicating an intention of a functional size API.

### Actual behavior

Setting the size on sp-tabs-overflow does not affect the size of sp-tabs.

### Screenshots

_No response_

### What browsers are you seeing the problem in?

Microsoft Edge, Chrome, Safari, Firefox

### How can we reproduce this issue?

1. Go to https://studio.webcomponents.dev/edit/Lug2VHrYmBmjUZDzwFJf/src/index.ts?p=stories
2. Set the size of sp-tabs-overflow to "s" or "l"
3. Observe how the tabs don't change sizes

### Sample code or abstract reproduction which illustrates the problem

_No response_

### Severity

None

### Logs taken while reproducing problem

_No response_

Start with packages/tabs/src/TabsOverflow.ts and review how it includes SizedMixin and handles the slotted sp-tabs elements. Reproduce the issue using the linked Studio example or the TabsOverflow size stories, then verify that setting sp-tabs-overflow to "s" or "l" changes the slotted tabs' size.

Written by the indexing model from the issue text.