[ContextualSaveBar] Register secondaryMenu prop in frame context

[whizkydee]

WHAT is this pull request doing?

Ref: Shopify/growth-activation#2363

An optional secondaryMenu prop was added to the ContextualSaveBar component in #5018 but wasn't registered in the frame context which prevented content passed to it from being rendered. This PR is simply an hotfix for that.

How to 🎩

🖥 Local development instructions
🗒 General tophatting guidelines
📄 Changelog guidelines

Copy-paste this code in playground/Playground.tsx:

import React from 'react';

import {Page, Button, ContextualSaveBar, Frame} from '../src';

export function Playground() {
  return (
    <Page title="Playground">
      <Frame>
        <ContextualSaveBar
          secondaryMenu={<Button>Setup Guide</Button>}
          discardAction={{content: 'Discard'}}
          saveAction={{content: 'Save'}}
        />
      </Frame>
    </Page>
  );
}

Confirm that a button that says "Setup Guide" is rendered before the discard and save buttons

🎩 checklist

• Tested on mobile
• Tested on multiple browsers
• Tested for accessibility
• Updated the component's README.md with documentation changes
• Tophatted documentation changes in the style guide
• For visual design changes, ping @ sarahill to update the Polaris UI kit

[github-actions]

size-limit report

Path	Size
cjs	164.57 KB (+0.01% 🔺)
esm	94.31 KB (+0.01% 🔺)
esnext	141.41 KB (+0.02% 🔺)
css	34.65 KB (0%)