feat(validator onboarding): create `BackButton.tsx`

src/pages/ValidatorOnboarding/ValidatorSetup/BackButton.tsx

@@ -0,0 +1,28 @@
+import { Text } from '@status-im/components'
+import { Stack, XStack } from 'tamagui'
+import { ArrowLeftIcon } from '@status-im/icons'
+import { useState } from 'react'
+type BackButtonProps = {
+  prevPage: string
+  buttonState: 'disabled' | 'enabled' | 'pressed'
+}
+const BackButton = ({ prevPage }: BackButtonProps) => {
+  const [buttonState, setButtonState] = useState('enabled')
+
+  return (
+    <XStack
+    >
+      <Stack
+        }}
+      >
+        <ArrowLeftIcon
+          size={16}
+        ></ArrowLeftIcon>
+      </Stack>
+        {prevPage}
+      </Text>
+    </XStack>
+  )
+}
+
+export default BackButton