[Tabs][BottomNavigation] TabContentItem background color not applied #7496

Environment

• CLI: rc
• Cross-platform modules: rc
• Android Runtime: rc
• iOS Runtime: rc

Describe the bug
TabContentItem background color is not applied.

To Reproduce
Use the following setup (also visible in e2e/ui-tests-app -> tabs -> background-color or e2e/ui-tests-app -> bottom-navigation -> background-color examples):

<Tabs>
  <TabStrip>
      <TabStripItem title="First" class="special"></TabStripItem>
      <TabStripItem title="Second"></TabStripItem>
  </TabStrip>

  <TabContentItem class="special">
      <GridLayout>
        <Label text="First View" />
      </GridLayout>
  </TabContentItem>

  <TabContentItem>
      <GridLayout>
        <Label text="Second View" />
      </GridLayout>
  </TabContentItem>
</Tabs>

TabContentItem.special {
  background-color: olive;
}

Expected behavior
TabContentItem background color should be respected when set.

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